Self teeth whitening?

Maybe it's because I drink coffee too often.

My teeth are yellowing.

Teeth that are already discolored cannot be whitened even if you brush frequently.

I guess there's no helping it...

But I can't give up coffee either..

It seems like teeth whitening procedures are quite popular these days.

I found that there are also self-administered options.

I'm not sure if it's okay to do self-teeth whitening.

Since my teeth are quite weak, whatever I try to do...

I'm worried first.