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Carbamide Peroxide
A prodrug of hydrogen peroxide — carbamide peroxide is hydrogen peroxide complexed with urea.
Aliases (6)
Overview
What is Carbamide Peroxide?
Carbamide peroxide is a stable complex of urea and hydrogen peroxide that releases hydrogen peroxide on contact with moisture. It is used topically for tooth whitening, in earwax removal preparations, and as an oral antiseptic. OTC and dental-prescribed.
Key Benefits
Effective tooth whitening (oxidative bleaching of enamel and dentin chromophores), gentle earwax softening and removal, and antiseptic action against oral and ear-canal microbes.
Mechanism of Action
On contact with tissue moisture, dissociates to urea + hydrogen peroxide (~33% H2O2 by weight). H2O2 oxidizes chromophores in enamel/dentin and produces reactive oxygen species that disrupt microbial cell membranes.
Pharmacokinetics
Research Indications
What it is
- Carbamide peroxide: CH₆N₂O₃ (CO(NH₂)₂·H₂O₂) - An adduct of urea and hydrogen peroxide in 1:1 molar ratio - White crystalline powder; ge…
Conversion to H2O2 in oral environment
- In contact with saliva + oral temperature: carbamide peroxide → urea + H2O2 - Mass ratio: 1 g carbamide peroxide → ~0.34 g H2O2 + ~0.66…
Why slower release matters
- Direct H2O2 has rapid catalase-mediated decomposition → ROS pulse - Carbamide peroxide releases H2O2 gradually over 30 min - several ho…
What urea does
- Urea is benign in oral environment (small amounts) - May actually help — urea slightly elevates pH, supporting tooth enamel remineraliz…
Final mechanism (same as H2O2)
- ROS oxidize chromogens (color compounds) - Tooth shade improves - See /home/ddb/projects/biohacking/research/compounds/hydrogen-peroxid…
What to Expect
- Week 1Tolerability and dose-response.
- Week 2-4Early effect window.
- Week 4-8Peak benefit assessment.
- Week 8+Cycle decision point.
Side Effects & Safety 8
Side Effects
- 1Tooth sensitivity — universal during 14-day course; resolves <1 week post
- 2Gum sensitivity if contact — minor blanching
- 3Mild dehydration of teeth during cycle — rehydrates over weeks
- 4Mild taste effects — variable
- 5Persistent sensitivity beyond cycle (rare)
- 6Gum recession with aggressive multi-cycle use
- 7Allergic reaction to gel formulation excipients
- 8Mild GI upset if accidentally swallowed (small amount)
When to Stop
- Severe sensitivity requiring desensitizer therapy
- Pulp damage with extended high-strength tray use
- Soft tissue burn with poorly-fitted tray + high-strength gel
- Stop if persistent gum bleeding
- Stop if persistent severe sensitivity
- Use desensitizing toothpaste between treatments
- Avoid mouthguard wear immediately after whitening (let teeth re-equilibrate)
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