Teeth whitening

As I get older, I realize that even smiling requires practice.

I can feel it, when I smile, there's a deep groove at the end of my teeth.

There is a slight area where the tooth becomes stained.

It has become a habit not to smile brightly because it looks more stained.

I often hear people ask if something is wrong whenever I meet acquaintances.

Practicing smiling in a way that shows teeth because it surprisingly causes some stress.

I think I want to do whitening and teeth cleaning first.

Among those who have tried teeth whitening, are there any discomforts experienced afterward?

I would appreciate it if you could let me know the timing of the MI (myocardial infarction) medication.