Is teeth whitening essential?

About twenty years ago, I used to do whitening treatments before bed.

I often heard people around me say, "Why are your teeth so white?"

I still hear people say it's white.

My eyes just look yellow to me, and it seems like my gums are also sagging.

I think my skin is naturally a bit whiter than others, but since it looks bright to me, I'm wondering if I should consider whitening.

These days, people do scaling treatments, but I wonder if they're pointless since the effects aren't as good as advertised.