How effective is teeth whitening these days?

I, who completely love coffee, have slightly yellow teeth.

I try to brush my teeth and take care of myself after drinking as much coffee as possible, but

It's difficult to proceed with the all-time progress.

So, about ten years ago, I had it done at a teeth whitening dental clinic.

I remember that the price was a bit high at that time.

The more episodes I go through, the more my teeth feel extremely cold.

I think we only proceeded up to three times and then finished.

Do your teeth still feel sensitive when you whiten your teeth these days?

Looking in the mirror, the yellowish tone bothers me.