After pregnancy due to changes in the eating habits of pregnant women, eating too much, or the frequency of eating, in addition, may also be due to the rise in the level of progesterone, resulting in inflammation of periodontal tissues will be more symptoms, there may be red and swollen gums, tartar buildup is too fast, and other symptoms will lead to the emergence of halitosis. The appearance of bad breath suggests that pregnant women can increase the number of brushing, rinsing, after eating can be brushed, rinsing, so as to reduce the accumulation of plaque, reduce the accumulation of food debris and other infectious substances, then it will reduce the incidence of bad breath. Pregnant women must maintain a healthy mouth, which will reduce the symptoms of bleeding gums.