As the active ingredient in the gel, carbamide or hydrogen peroxide, is broken down oxygen enters the enamel and dentin and bleaches the colored substances. The tooth color is made lighter. Results are usually seen within the first week. Maximum results occur over the next 14-21 days. Patients with Tetracycline stain may bleach up to 6 months.
Some people experience increased tooth sensitivity to cold during treatment.
Others have reported discomfort, in the gums or a sore throat. These symptoms always disappear within 1-3 days after stopping or completion of treatment. Previous white fillings in front teeth may need to be redone. The teeth will be lighter than they were. Some patients may need periodic re-bleaching.