Dear, I am a cold and beautiful tooth! Standby period can be used! You can use it as long as you are not pregnant! Tooth beauty instrument has no side effects, but the main component of whitening gel inside is hydrogen peroxide, so there will be no side effects without touching gums during use! Is there anything pregnant women can't use? Because the ability of pregnant women is a special physique! Special constitution! Even many foods are not recommended! So our cold teeth can be used as long as they are not pregnant! Don't use it if you are pregnant.