Asked for male, 24 years old from Raebareli
Teeth have a protective layer called enamel with age the enamel wears off and become thin which causes to become teeth sensitive to cold and hot. You need to get a professional check up done to know the exact cause and solution of your problem. There are various method / products available to whiten teeth. The most effective is in-office whitening done by a dental professional. It's usually a one hour procedure in which whitening gel will apply to the teeth and activate by whitening light for 10 to 15 minutes. 2 or 3 such sessions may required.