After pregnancy, due to the dramatic increase of estrogen and progesterone, the capillaries will become “brittle”, which aggravates the reaction of gums to local stimuli and amplifies the original inflammatory reaction, often manifesting as swollen gums, bleeding, bad breath during pregnancy, and in severe cases, loose teeth, pain and tooth displacement, which can be reduced or subside on their own after delivery. Therefore, a comprehensive oral examination should be performed before pregnancy to try to deal with various dental problems.