Hi lybrate-user! its good to hear that you stopped smoking! apart from yellowing your teeth it is also a leading cause of oral cancer. To make your teeth white again you can 1. Go to a dentist, get scaling and polishing done. Ask for bleaching your teeth.
2. Try rubbing strawberries on your teeth. Keep it for 2-3 mins and rinse. Repeat 3 times a week.
There are various home based methods which proclaim to brighten up your teeth but over zealous use of them can lead to enamel weakening and porosities and hence teeth sensitivities.
Teeth leaching by dentist will be ideal treatment for you to achieve sparkling white teeth.
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