The BriteSmile procedure is safe and will not damage tooth enamel or existing fillings. Hydrogen peroxide is the primary ingredient in BriteSmile’s gel and has been safely used in teeth whitening for many years. The BriteSmile gel contains a lower concentration of peroxide than other gels because of its revolutionary light that allows it to work better with less irritation. Most patients experience no pain or sensitivity during or after the treatment and if side effects do occur they almost always go away within 24 hours.