Bad breath after IVF may be related to dry mouth, gastrointestinal diseases and other reasons. 1. Dry mouth: During the embryo implantation period after in vitro fertilization, women may have a strong early pregnancy reaction due to early pregnancy, which may cause less food intake and less water intake, thus resulting in dry mouth and bad breath. 2. Gastrointestinal diseases: bad breath after in vitro fertilization may also be related to the presence of gastrointestinal diseases, if the recent diet is not paid attention to or the body’s digestive system is relatively poor, it may make the food digestion is incomplete, and then due to gastrointestinal discomfort bad breath. There may also be other reasons for bad breath after IVF transplantation, it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment or therapy.