I'm concerned about teeth whitening.

Hello. I often see celebrities on TV with very white teeth, and I feel so enviousㅠ Most of them are said to have veneers, but somehow my teeth look yellow, so I started to consider teeth whitening. If anyone has actually tried it, I wonder about the price per session, whether they saw any results, and if it hurts(?) I have no information about these things, so I am curious about many aspects! There shouldn't be any side effects, right..? I'm curious about teeth whitening!