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.
Generally, the longer you keep a stronger solution on your teeth, the whiter your teeth become. However, the higher the percentage of peroxide in the whitening solution, the shorter it should be applied to the teeth.
Keeping the gel on longer will dehydrate the tooth and increase tooth sensitivity.
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Fuente: Youtube/ Selina Sufraz Dentist-The Dental Sage