I want to get teeth whitening~

Lately, every time I brush my teeth and look in the mirror, I really want to get teeth whitening.

Maybe because I enjoy drinking coffee, my teeth seem to be heavily stained.

Lately, I really want to have white teeth..

Has anyone tried teeth whitening?

I'm curious about how to do whitening.

Are there any side effects or weakening of the teeth after whitening?

Is it something I only need to receive once, or do I need to receive it regularly?

Sometimes I get a text from the dentist I visit occasionally saying they will do teeth whitening...

I want to try it, but I'm worried because I've never done it before.