It is said that whitening teeth is good. Is it true?/You don't say.

Whitening teeth generally does not hurt teeth. White teeth whitening is aimed at mild tetracycline teeth, dental fluorosis and other mild yellow teeth. The whitening effect can be maintained for 5-8 years, and the tooth color can be improved by 5-8 grades. Specific suggestions: you can go to the hospital for an oral examination and have a whitening plan that suits you according to your own dental conditions.