If your teeth are very sensitive, you'd better not buy any rubbish in the market, so your teeth may become more sensitive. Go directly to the dentist's office for consultation if you have time. Finally, I went to the dentist to ask about it, so that my teeth can be whitened ~ I might as well go to a professional doctor to get it, so that I can protect myself. Are you familiar with the East Side? From dunhua station, Xiao Zhong, you can go to Ada Finch's dentist's office. I did tooth whitening for Dr. Wu Quanlun inside, and the effect was really extraordinary. I highly recommend you to ask.