I'm curious about how teeth whitening is done.

I am quite close with the dentist.. Since Miss, this has been weak itself and I go for treatment because of cavities.

I went there a lot lol, and among the two front teeth, one of them is covered with a zirconia crown on each side.

The original tooth I have, if you look closely, the shade difference is slightly noticeable.

Can teeth whitening make the teeth the same color? How is the treatment process carried out? And what is the approximate cost?

I'm very curious... I also want to know if it needs to be done regularly ^^