Peroxide-Free Alternatives: The Best Whitening Ingredients (Featuring PAP+) for 2026

Choosing a teeth whitening formula is no longer simply a choice between “peroxide” and “peroxide-free.”

For oral care brands, wholesalers and e-commerce sellers, the correct formula depends on several factors:

• The target market and local regulatory requirements
• The expected whitening performance
• The sensitivity positioning of the product
• The intended sales channel
• The product format and retail price
• The claims the brand wants to make
• The testing available to support those claims

PAP, sodium chlorite, hydrogen peroxide, enzymes and mineral-based ingredients all follow different whitening or stain-removal mechanisms. They should not be marketed as interchangeable ingredients.

This guide explains the differences between the main teeth whitening formula routes and provides a practical framework for selecting an OEM or private label solution.

 

The Main Teeth Whitening Formula Paths

1. Hydrogen Peroxide and Carbamide Peroxide

Hydrogen peroxide remains one of the most established active ingredients for chemical tooth bleaching.

It works by oxidizing colored organic molecules within stains, reducing their ability to absorb visible light. Carbamide peroxide releases hydrogen peroxide more gradually and is commonly used in whitening gels and tray-based systems.

Peroxide formulas are generally best suited to brands that prioritize:

• Established whitening performance
• Faster visible results
• Professional or dentist-supervised products
• Markets where the selected concentration is permitted
• Consumers already familiar with conventional whitening

The main commercial limitation is sensitivity positioning. Tooth sensitivity and soft-tissue irritation are recognized potential side effects of peroxide bleaching, although the frequency and severity depend on concentration, treatment time, product design and individual users. The American Dental Association notes that temporary mild-to-moderate sensitivity can occur during bleaching treatment.

Peroxide formulas should not automatically be described as harmful. Properly formulated products can provide effective whitening, but concentration, exposure time, instructions and market regulations must be managed carefully.

2. PAP Whitening Formulas

PAP stands for Phthalimidoperoxycaproic Acid.

It is used in peroxide-free whitening strips, gel pens and home whitening kits as an alternative oxidizing ingredient. Rather than relying on hydrogen peroxide, PAP reacts with stain-causing chromogens through a different oxidation pathway.

PAP is particularly relevant for brands targeting:

• Consumers concerned about sensitivity
• Peroxide-free product positioning
• Direct-to-consumer oral care brands
• Premium or innovation-focused whitening lines
• Markets where OTC peroxide levels are restricted
• Alcohol-free or comfort-oriented whitening strips

Research into PAP is promising, but brands should avoid presenting every PAP product as clinically equivalent.

Some laboratory and early clinical research has reported whitening effects with limited changes to enamel morphology. However, other studies have found that performance varies significantly between PAP concentrations, formulations and treatment protocols. A 2026 study, for example, found that the PAP system tested did not produce significant bleaching under its specific protocol, while hydrogen peroxide did.

This means the correct commercial message is not:

“Every PAP product is as effective as peroxide and causes zero sensitivity.”

A more responsible positioning is:

“PAP provides a hydrogen-peroxide-free whitening route designed for brands seeking a balance between stain oxidation, user comfort and differentiated product positioning.”

The actual whitening result must be supported by testing on the finished formulation.

3. Sodium Chlorite Whitening Formulas

Sodium chlorite is another non-hydrogen-peroxide active ingredient used in whitening strips and gel pens.

It should not be treated as another name for PAP. The two ingredients have different chemical properties, stability requirements and formulation considerations.

Sodium chlorite products may be suitable for:

• Non-hydrogen-peroxide product lines
• Value-oriented peroxide-free products
• Dry-strip and gel-strip formats
• Private label brands that need several formula options
• Retailers seeking alternatives to conventional peroxide strips
• Brands developing differentiated entry-level whitening products

The effectiveness and safety profile of a sodium chlorite product depend heavily on the complete formula, including pH, concentration, contact time and supporting ingredients.

Laboratory research comparing OTC whitening products has shown that different sodium chlorite and PAP formulations can produce very different whitening and enamel-surface outcomes. The ingredient name alone is therefore insufficient to establish product performance or safety.

For OEM development, sodium chlorite formulas should be evaluated through:

• Active-ingredient testing
• pH control
• Whitening efficacy testing
• Enamel surface and microhardness assessment
• Packaging compatibility testing
• Stability and shelf-life testing
• Oral irritation assessment where required

Brands should also avoid making antimicrobial or therapeutic oral-health claims unless those claims are specifically permitted and supported in the target market.

4. Enzyme-Based Whitening Ingredients

Papain, bromelain and similar proteolytic enzymes mainly help break down proteins within the acquired pellicle—the thin film on the tooth surface where external stains can accumulate.

Enzyme-based systems are most appropriate for:

• Surface-stain removal
• Daily oral care
• Gentle or naturally positioned products
• Whitening toothpastes and maintenance gels
• Consumers with coffee, tea or tobacco-related external stains
• Brands seeking alternatives to aggressive abrasives

Early research suggests that papain- and bromelain-based gels may contribute to stain removal and color improvement. However, much of the evidence remains laboratory-based, and these ingredients should not automatically be promoted as replacements for deep chemical bleaching.

Suitable claims may include:

• Helps remove surface stains
• Supports a brighter-looking smile
• Enzyme-powered stain removal
• Designed for daily whitening maintenance

Claims such as “deep bleaching,” “professional whitening” or “removes intrinsic discoloration” require stronger product-specific evidence.

5. Abrasive, Adsorptive and Mineral-Based Ingredients

This category includes:

• Hydrated silica
• Sodium bicarbonate
• Activated charcoal
• Hydroxyapatite
• Calcium-based minerals
• Optical color-correcting pigments

These ingredients do not all work in the same way.

Fine abrasives physically polish external stains from the tooth surface. Activated charcoal is mainly an abrasive and adsorptive material. Optical pigments temporarily alter the visual perception of tooth color.

Hydroxyapatite is primarily used as a biomimetic mineral. It may improve surface smoothness, support remineralization and contribute to a brighter appearance by interacting with the enamel surface. Evidence suggests that hydroxyapatite toothpastes can help remove or reduce external stains, but hydroxyapatite should not be presented as a direct equivalent to an oxidizing bleaching agent.

These ingredients are better positioned in:

• Whitening powders
• Toothpastes
• Post-whitening care
• Daily stain-control products
• Enamel-care extensions
• Maintenance products within a broader whitening range

PAP vs Hydrogen Peroxide vs Sodium Chlorite

Hydrogen Peroxide

Primary strength: Established and predictable bleaching performance.

Best suited to: Performance-led products, professional channels and markets where the intended concentration and sales model are permitted.

Main consideration: Sensitivity, exposure time and regulatory limitations.

PAP

Primary strength: Differentiated hydrogen-peroxide-free oxidation pathway.

Best suited to: Premium peroxide-free products, sensitive-consumer positioning and innovation-led DTC brands.

Main consideration: Results are highly formulation-dependent, and the clinical evidence base remains smaller than that for peroxide.

Sodium Chlorite

Primary strength: Flexible non-hydrogen-peroxide option for strips and pens.

Best suited to: Value-oriented peroxide-free products, dry strips, wholesalers and brands building multi-formula product portfolios.

Main consideration: pH, stability, enamel compatibility and claim control require careful formulation and testing.

There is no single formula that is best for every brand.

The correct choice depends on the market opportunity the product is intended to address.

Which Formula Is Better for Sensitive Consumers?

Consumers with a history of sensitivity often look for peroxide-free products, but “peroxide-free” should not be interpreted as “guaranteed to cause no sensitivity.”

User comfort is influenced by:

• Active ingredient concentration
• Formula pH
• Treatment duration
• Strip adhesion and gel distribution
• Existing enamel condition
• Gum contact
• Frequency of use
• Flavoring and solvent systems
• Desensitizing or mineral-support ingredients

A PAP or sodium chlorite formulation may support a lower-sensitivity product position, but the final product should be evaluated rather than relying on the active ingredient alone.

Safer consumer-facing language includes:

• Designed for a comfortable whitening experience
• Developed for consumers concerned about sensitivity
• Hydrogen-peroxide-free formula
• Gentle-use whitening format
• Formulated with enamel-care ingredients

Avoid absolute language such as:

• Causes zero sensitivity
• Completely harmless to enamel
• Safe for every user
• Cannot irritate gums
• Guaranteed pain-free whitening

Consumers with untreated cavities, gum disease, exposed roots, cracked teeth or persistent sensitivity should be advised to consult a dental professional before using a whitening product.

Market and Channel Considerations

Peroxide-Restricted OTC Markets

In the European Union, products containing more than 0.1% and up to 6% hydrogen peroxide are subject to professional-channel restrictions, including an initial application or use under the supervision of a dental practitioner. Products containing more than 6% hydrogen peroxide are not permitted under the applicable cosmetic framework.

For brands targeting markets with strict OTC peroxide limits, PAP or sodium chlorite may provide alternative product-development routes.

However, a non-peroxide product does not automatically “bypass” regulation. Ingredient safety, claims, labeling, product category and local market requirements must still be reviewed.

E-Commerce and DTC Brands

PAP formulas are often suitable for e-commerce brands because they provide a clear differentiation message:

• Peroxide-free
• Designed for comfort
• Convenient at-home use
• Modern formula positioning
• Suitable for premium packaging

Sodium chlorite can provide another non-peroxide option for brands that need a more accessible price point or a wider selection of strip technologies.

For online channels, the formula must also be matched with:

• Clear use instructions
• Realistic result expectations
• Ingredient transparency
• Before-and-after evidence
• Marketplace-compliant claims
• Packaging suitable for fulfillment and transportation

Dental and Professional Channels

Professional channels may place greater emphasis on:

• Higher whitening performance
• Controlled application
• Documented treatment protocols
• Professional supervision
• Higher active concentrations
• Technical test data

Peroxide systems may remain appropriate for these channels, subject to local regulations and professional-use requirements.

Beauty Salons and Retail Stores

Salon and retail products normally require a balance between:

• Ease of use
• Attractive packaging
• Controlled treatment time
• Consumer-friendly instructions
• Lower complaint risk
• Repeat-purchase potential

PAP strips, sodium chlorite strips and lower-intensity maintenance products can be considered, depending on the applicable regulations.

Claims Brands Can and Cannot Make

Formula selection and marketing claims must be developed together.

A technically good product can still create regulatory or marketplace risk if it is promoted using unsupported language.

More Defensible Claim Directions

Depending on the available evidence, brands may consider:

• Hydrogen-peroxide-free
• Helps remove tooth stains
• Helps improve the appearance of tooth color
• Designed for at-home whitening
• Developed for consumers concerned about sensitivity
• Alcohol-free formula
• Helps remove surface stains
• Visible results after a specified treatment period
• Tested for whitening performance
• Formulated with enamel-care ingredients

Any measurable claim, such as a number of shades or a specific number of days, should be supported by testing on the finished product.

Claims Requiring Strong Evidence or Regulatory Review

Brands should be cautious with:

• Zero sensitivity
• No enamel damage
• Clinically proven
• Dentist approved
• Repairs damaged enamel
• Eliminates bacteria
• Treats gum disease
• Prevents cavities
• Professional results in one use
• Equivalent to a specific peroxide concentration
• Safe for pregnant women or children
• Suitable for everyone

In the United States, whether a product is regulated as a cosmetic or a drug can depend on its intended use and the claims made for it. Disease-treatment or structural-function claims may change the regulatory classification of the product.

A Practical OEM Formula Selection Framework

Step 1: Define the Target Market

Before selecting an active ingredient, determine:

• Target country or region
• OTC, professional or salon channel
• Marketplace requirements
• Age restrictions
• Ingredient restrictions
• Required labeling language
• Product notification or registration requirements

The formula should be selected for the intended market—not developed first and reviewed later.

Step 2: Define the Consumer Positioning

Decide whether the product is intended to emphasize:

• Maximum whitening performance
• Peroxide-free whitening
• Sensitivity-conscious use
• Natural stain removal
• Daily maintenance
• Premium oral care
• Entry-level affordability
• Professional application

Trying to communicate all of these positions through one product usually results in unclear marketing.

Step 3: Choose the Whitening Mechanism

Select the active route according to the product objective:

• Hydrogen peroxide: established oxidation and performance-led positioning
• PAP: premium peroxide-free oxidation and comfort-led positioning
• Sodium chlorite: flexible non-peroxide alternative for multiple formats
• Enzymes: surface-stain and maintenance positioning
• Abrasives or minerals: polishing, stain control and enamel-care positioning

Step 4: Select the Product Format

The same active ingredient can perform differently in different delivery systems.

Common OEM formats include:

• Gel whitening strips
• Dry whitening strips
• Residue-free strips
• Dissolving strips
• Whitening gel pens
• Syringe gels
• LED home whitening kits
• Whitening powders
• Toothpastes and maintenance products

Brands should evaluate adhesion, gel distribution, treatment time, saliva interaction, removal experience and packaging stability—not only the ingredient list.

Step 5: Build the Supporting Formula

Supporting ingredients can influence comfort, stability and user experience.

Depending on the formulation, these may include:

• Hydroxyapatite
• Potassium citrate
• Potassium nitrate
• Fluoride
• Calcium compounds
• Humectants
• Flavor systems
• pH-control ingredients
• Adhesion polymers

These ingredients can support the product concept, but they should not be used to exaggerate the performance of the primary whitening active.

Step 6: Define the Testing Plan

Before confirming commercial claims, brands should consider testing for:

• Active-ingredient concentration
• Formula pH
• Product stability
• Packaging compatibility
• Whitening efficacy
• Color change using recognized measurement methods
• Enamel surface microhardness
• Surface erosion or roughness
• Oral irritation or cytotoxicity where required
• Microbiological quality
• Shelf life
• Finished-product consistency

ISO 28399 establishes requirements and testing principles for external tooth-bleaching products, including packaging, labeling and manufacturer instructions.

Step 7: Match Claims to Evidence

The final packaging and product page should only include claims supported by:

• Finished-product test reports
• Ingredient documentation
• Stability data
• Consumer or clinical studies
• Regulatory review
• Approved usage instructions

Evidence for one supplier’s PAP or sodium chlorite product cannot automatically be applied to another formulation.

How to Build a Complete Teeth Whitening Product Cluster

For a manufacturer or oral care brand, PAP should not replace every other formula. It should occupy a clear position within a broader product architecture.

A practical product cluster may include:

Performance Line

Hydrogen peroxide whitening strips for markets and channels that prioritize established whitening performance.

Sensitive-Positioned Peroxide-Free Line

PAP whitening strips for consumers who actively seek hydrogen-peroxide-free products and a more comfort-oriented experience.

Alternative Peroxide-Free Line

Sodium chlorite strips or gel pens for brands that need another non-hydrogen-peroxide formula, different strip formats or a more flexible price structure.

Convenience Line

Whitening gel pens and home whitening kits for targeted application, travel use, product bundling and repeat purchases.

LED devices should be presented primarily as a convenient delivery format unless the finished system has evidence showing that the light produces an additional whitening benefit. Research into PAP and LED combinations remains mixed.

Daily Maintenance Line

Whitening powders, enzyme products and mineral-based oral care products for surface-stain management and post-whitening maintenance.

This structure prevents keyword and product cannibalization because each formula has a defined:

• Customer group
• Market position
• Price level
• Whitening mechanism
• Claim strategy
• Product-page search intent

OEM and Private Label Whitening Solutions from Double White

Double White supports multiple teeth whitening formula paths rather than limiting brands to a single active ingredient.

Available product-development directions include:

• Hydrogen peroxide teeth whitening strips
• PAP teeth whitening strips
• Sodium chlorite teeth whitening strips
• Teeth whitening gel pens
• LED home whitening kits
• Teeth whitening powders
• Customized oral care products

OEM and ODM support can include formula selection, flavor customization, strip structure, packaging development, sample production, logo printing and bulk manufacturing.

Instead of recommending the same formula to every buyer, the formula should be selected according to the buyer’s target market, sales channel, price positioning and intended claims.

Conclusion

Peroxide-free whitening is not a single product category.

PAP, sodium chlorite, enzymes, abrasives and mineral ingredients follow different mechanisms and serve different commercial purposes. Hydrogen peroxide remains an established performance route, while PAP provides a differentiated hydrogen-peroxide-free option. Sodium chlorite offers another flexible pathway, and enzyme or mineral products are better suited to surface-stain control and daily maintenance.

For brands, the best formula is not simply the ingredient with the strongest marketing story.

It is the formula that matches the target market, consumer expectations, product format, testing strategy and legally supportable claims.

A successful OEM project should therefore begin with market and product-positioning decisions before moving into formula development, packaging and mass production.

FAQ

Is PAP the same as hydrogen peroxide?

No. PAP is not hydrogen peroxide or carbamide peroxide. It is a different oxidizing ingredient with a different reaction pathway. However, PAP is chemically a peroxy acid, so “hydrogen-peroxide-free” is often a more technically precise description than suggesting that PAP contains no peroxide chemistry of any kind.

Is peroxide-free whitening always safer?

No formula is automatically safe simply because it is peroxide-free. Safety depends on concentration, pH, exposure time, supporting ingredients, product format and manufacturing quality.

Which is better: PAP or sodium chlorite?

PAP is generally better suited to premium, innovation-led and sensitivity-positioned products. Sodium chlorite can provide a flexible alternative for non-peroxide strips and pens. The correct choice depends on market position, performance testing and cost structure.

Which formula is best for sensitive consumers?

A well-designed PAP or sodium chlorite formula may be considered for a sensitivity-conscious product line. However, brands should avoid promising zero sensitivity without appropriate finished-product evidence.

Can hydroxyapatite whiten teeth?

Hydroxyapatite may help reduce surface stains, smooth the enamel surface and improve the visual appearance of teeth. It is better positioned as a maintenance or enamel-care ingredient than as a replacement for an active bleaching agent.

Does activated charcoal bleach teeth?

Activated charcoal mainly removes surface stains through abrasion and adsorption. It does not chemically bleach intrinsic stains in the same way as peroxide or PAP.

Can an EU brand sell hydrogen peroxide whitening strips online?

EU rules restrict consumer access to products containing more than 0.1% hydrogen peroxide. Products above that threshold and up to 6% are subject to dental-professional conditions. Each product and sales model should receive market-specific regulatory review.

What tests should an OEM whitening product complete?

The test plan may include active assay, pH, stability, whitening efficacy, enamel surface testing, microbiological quality, packaging compatibility and irritation-related assessments.

Should a brand launch only one whitening formula?

A startup may begin with one clearly positioned hero product. A larger brand may benefit from a three-level portfolio consisting of a performance peroxide line, a premium PAP line and an alternative sodium chlorite line.