People who have sensitive teeth may want to check in with their dentist before using hydrogen peroxide to whiten the teeth. However, another study in the American Journal of Dentistry found that a commercial mouthwash containing only 1.5% hydrogen peroxide caused a noticeable lightening in human tooth enamel after 4 weeks. Higher concentration gels often require less time on the teeth to be effective, which can reduce the risk of enamel damage. In fact, the authors of a 2016 study found that lower concentration gels had more negative effects on tooth enamel when they remained on the teeth for longer periods. However, it does appear that the length of time that these products spend on the teeth is important. Many people worry that higher concentrations of peroxide may lead to more side effects, such as enamel breakdown and tooth sensitivity, but this is not always the case. On the other hand, most store-bought hydrogen peroxide has a 3% concentration. Dentists may also offer whitening treatments with hydrogen peroxide concentrations of up to 40%. The concentration of hydrogen peroxide in store-bought teeth whitening kits can be as high as 10%. Peroxide can partially penetrate the layers of the teeth, removing compounds that cause discoloration. Products containing peroxides, such as hydrogen peroxide and carbamide peroxide, act as bleaching agents to change the color of the teeth. Hydrogen peroxide is a common and effective active ingredient in many commercial teeth whitening solutions. A person can make a hydrogen peroxide paste or mouthwash at home.
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