Can yellow teeth really become white with teeth whitening?

My teeth have been a bit yellow since I was little, so I get self-conscious every time I smile 😥

I've heard that teeth whitening is really popular these days, so I'm looking into it. I'm wondering if it works on teeth that are naturally yellow like mine.

I'm hesitant because I've heard that the whitening effect isn't very significant if the teeth are naturally yellow rather than just stained.

I also want to know how much of a difference there is between dental whitening and DIY whitening.

I'm also curious about how much brighter it gets with just one application and how long the effect lasts.

I can't easily make a decision because I'm worried about sensitivity or side effects.

For those who have tried whitening treatments in similar cases, please share your honest reviews on how the results were 🙏