[Concern] My teeth are yellow, so I'm worried about teeth whitening... haha

I'm considering whether to whiten my teeth lately because they tend to be a bit yellow.

I need to do internet searches and such, but I'm too lazy, so I just keep thinking about it but can't put it into action.

It makes me nervous every time I smile... and also when I talk...ㅠㅠ
I recently got and am using toothpaste that is said to be good for teeth whitening...^^

Will toothpaste be helpful?

What you are curious about

1) Is teeth whitening effective at the dentist?

Some people say that teeth whitening is bad for dental health... Are there any side effects?

3) How much does it cost?

4) Is it okay to undergo treatment for tooth sensitivity at the same time as teeth whitening?