Want a brighter smile? When it comes to tooth-whitening, you've got two options: in-office-based teeth bleaching, or at-home care.
Both tooth-whitening options use peroxide-based bleaching agents. At-home systems contain from 3% to 20% peroxide (carbamide or hydrogen peroxides). In-office systems contain from 15% to 43% peroxide.
Tooth-whitening works best for people with yellow teeth and is less effective for people with brown teeth. If your teeth are gray or purple, tooth bleaching probably won't work at all.
To be sure tooth-whitening is worth your time and money.