Question 394 · LDEK · Tooth discoloration and bleaching
Carbamide peroxide is used widely nowadays for dentist-prescribed at-home bleaching procedures. When it comes in contact with saliva and other oral fluids, it breaks into two compounds. Which product of this chemical reaction is the active ingredient, i.e. which product and at which concentration is directly responsible for the whitening of the tooth structure?
- A. 3% hydrogen peroxide.
- B. 7% hydrogen peroxide.
- C. 3% urea.
- D. 7% urea.
- E. 3% urea carbamate.
Hint
Carbamide peroxide splits roughly one third into the oxidizing agent and two thirds into a by-product; apply this to a typical 10% gel.
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