Do you also perform teeth whitening treatments at the dental clinic?

I'm concerned because my teeth are somewhat yellow, and lately I've become interested in teeth whitening...

It makes me nervous every time I smile... and also when I talk...ㅠㅠ

I recently managed to get toothpaste that is said to be good for teeth whitening...

Do you also offer whitening treatments at the dental clinic? And I am curious about the effectiveness as well.

Some people say it's not good... Are there any side effects?

How much does it cost?

And please recommend a good dentist in Gwangju Metropolitan City.