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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.