The foam in the mouth of pregnant women is always caused by dietary reasons should be adjusted dietary habits, due to the lack of vitamins caused by the body should be supplemented with the right amount of nutrients needed. 1. Dietary habits: usually, women who often have foam in their mouths during pregnancy may be related to recent dietary inappropriate, such as excessive intake of stimulating foods, this time should adjust the diet, to light diet, eat more fresh fruits and vegetables. 2. Lack of vitamins: the lack of vitamins in the female organism may lead to damage to the oral epithelium, resulting in oral discomfort, you can go to the hospital for a detailed examination of the signs, targeted supplementation of nutrients, and in daily life to eat more vitamin-rich foods, such as kiwi, bananas, tomatoes and so on. During pregnancy, pregnant women should pay attention to do a good job of prenatal checkups, actively listen to the advice of professional doctors to do a good job of comprehensive care and health care, pay attention to rest, at the same time should be relaxed, to avoid nervousness, anxiety. Pregnant women always have foam in the mouth may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.