What is carbamide peroxide?

Carbamide peroxide is a whitening ingredient used in gels and professional whitening systems.When applied to teeth, it breaks down into:

• hydrogen peroxide (the active whitening agent)
• urea (helps stabilise the formula)

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This breakdown allows carbamide peroxide to whiten teeth more gradually and gently than pure hydrogen peroxide.

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How carbamide peroxide whitens teeth

1. Breaks down stain molecules

Hydrogen peroxide penetrates enamel and dissolves deep stains.

2. Works gradually

Carbamide peroxide releases hydrogen peroxide slowly, making it ideal for longer wear times.

3. Targets internal and external stains

It can lighten stains caused by food, drink, smoking and natural ageing.

4. Safe when dentist‑supervised

Professional guidance ensures correct strength and usage.

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Carbamide peroxide vs hydrogen peroxide

What results can you expect?

Carbamide peroxide can lighten teeth by several shades, depending on:

• stain type
• concentration
• wear time
• consistency
• enamel thickness

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Most people see results within 1–2 weeks, with full results after 2–4 weeks.

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Common strengths of carbamide peroxide

10%

Gentle, ideal for sensitive teeth or overnight wear.

16%

Balanced strength for most whitening plans.

22%

Stronger whitening for deeper stains (dentist‑supervised only).

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Pros and cons of carbamide peroxide

Pros

• gentle on enamel
• ideal for longer wear times
• predictable results
• dentist‑approved
• suitable for sensitive teeth

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Cons

• slower than hydrogen peroxide
• may cause temporary sensitivity
• not effective for internal stains (e.g., tetracycline)
• requires consistent use

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Myths about carbamide peroxide

Myth 1: It damages enamel

Fact: When used correctly, it does not harm enamel.

Myth 2: Higher strength = better results

Fact: Stronger gels can increase sensitivity without improving whitening.

Myth 3: It works instantly

Fact: Carbamide peroxide whitens gradually over days or weeks.

Myth 4: It whitens crowns or fillings

Fact: Only natural teeth respond to whitening.

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Is carbamide peroxide safe?

Yes : When used under dentist guidance.

Temporary side effects may include:

• mild sensitivity
• gum irritation
• dryness

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These usually settle within a few days.

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Who carbamide peroxide works best for

Great candidates

• coffee/tea drinkers
• smokers
• people with yellowing from age
• people wanting gentle, gradual whitening

May need alternative treatment

• deep internal stains
• patchy discolouration
• gum recession
• untreated cavities

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Dentist assessment is essential before whitening.

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How to use carbamide peroxide safely

1. Follow dentist instructions

Strength and wear time matter.

2. Avoid hot drinks during whitening

Heat can irritate enamel.

3. Brush gently with the Toothfairy Wand

Its Reflex Tech bristles help reduce sensitivity.

4. Avoid staining foods for 48 hours

Coffee, tea, red wine and curry can reduce results.

5. Use sensitivity toothpaste if needed

Helps manage temporary discomfort.

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How Toothfairy supports whitening decisions

Photo‑based assessments

Upload images to check whether carbamide peroxide is suitable for your teeth.

Dentist‑led advice

Get personalised guidance on strength, safety and expected results.

Support for sensitivity

Dentists can recommend safe ways to reduce discomfort.

Clear next steps

Know whether strips, gels or professional whitening are best for your teeth.