Tooth Whitening With Hydrogenperoxide in Adolescents

The specific objective of this study is: * Evaluate and quantify colorimetric changes in young permanent anterior teeth; * Compare the efficiency and efficacy of three gels used for self-administered home whitening and an over the counter whitening strip; * Analyze the increase in dental sensitivity in adolescent patients submitted to home whitening with 6% and 7.5% hydrogen peroxide with and without the addition of calcium (whitening strips); * Assess sensitivity, comfort and acceptance of whitening strips by patients; * Assess patient satisfaction with the method and material used for home whitening.