Isn't teeth whitening a good option?

Isn't teeth whitening, unlike laminate, performed without much pain?

There is also teeth whitening toothpaste, but I don't have high expectations.

I think there are also products that can be worn in the mouth like a mouthpiece.

It seems there are also procedures where they shine light or laser after applying medication at the dental clinic.

But I think this is good, are there any side effects?

I read some comments asking if it's okay to do something like tooth sensitivity, and there are also comments recommending against it due to side effects.

Since it involves the most important part, the teeth, I am cautious, but having white teeth also seems to be an important factor in creating a good image.