More than 20 years of analysis and surveillance of the teeth whitening process and with complete assurance, it can be concluded that teeth whitening has no adverse effects or destructive side effects. The tooth cavity does not change, there is no demineralization and the teeth are not extracted from the loss of mineral substances. Even old inadequate bleaching systems have not shown any negative effects on the tooth and dental minerals. As these older systems have become excessive tooth whitening and then dental sensitivity is present. Peroxide is dissociated into water and oxygen active. Hydrogen has been used for more than 50 years in dentistry, and no negative effects on the teeth have been observed during its use. In the range of dental cosmetic interventions, teeth whitening is the process that convincingly produces the least pain, adverse and side effects.