Pregnant women belong to a special period, the growth and development of the fetus needs a lot of substances, can cause vitamin B2 and other deficiencies in the pregnant woman’s body, easy to cause mouth ulcers. If mouth ulcers occur in late pregnancy or ulcers have seriously affected the quality of life, can be used topical spray, such as watermelon cream spray, but some sprays for pregnant women are prohibited, you need to follow the doctor’s instructions to use. If in early pregnancy, and mouth ulcers surface is small, can be appropriate to drink more water, light diet, pay attention to oral hygiene, eat more vegetables and fruits containing vitamins, etc. for relief, mouth ulcers for self-limiting diseases, usually 7 to 10 days to recover, can not use medication. Pregnant women with mouth ulcers should be under the guidance of a doctor to standardize the treatment, avoid unauthorized use of drugs. The drugs mentioned above should also be used under the guidance of a doctor.