What about teeth whitening?

Does teeth whitening really make your teeth feel sensitive?

As I get older, my teeth are becoming more yellow. Tooth discoloration doesn't affect oral health, but it looks unattractive and gives the impression of poor cleanliness.

My daughter says it's not just once but takes several tries, but smiling confidently is also important. But at our age, we shouldn't bleach or be so sensitive that we can't even drink ice water^^;