During pregnancy, changes in hormone levels during pregnancy can cause gingival hypertrophy and other conditions that predispose to gingivitis and cause gingival bleeding, especially after brushing teeth, which is a common symptom in late pregnancy. This is a common symptom in late pregnancy. It is affected by a large amount of estrogen and mechanical factors, as well as the influence of drugs. If gingivitis causes gingival bleeding, teeth are prone to loosening and tooth decay, and if gingival hyperplasia is particularly obvious, such patients will even sometimes have spontaneous bleeding of gums when brushing teeth, and some patients will develop real periodontal disease if they do not pay attention to it, and some of them will even have loose teeth or even lose teeth. Differential diagnosis of gingival hypertrophy: Gingival hyperplasia: This disease can be a gingival manifestation of a systemic disease or a manifestation of drug side effects after taking certain drugs. Clinical symptoms: Spontaneous gingival hyperplasia is a hereditary disease, seen in hereditary gingival fibromatosis and tuberous sclerosis. It begins in early childhood with diffuse hypertrophy of the gingiva, which can partially cover the teeth. Some medications can cause gingival hyperplasia, such as phenytoin sodium for epilepsy, which causes gingival hyperplasia after long-term use, and gingival hypertrophy and hyperplasia at the roots of the teeth. Swollen gums: The gums are flushed and swollen, usually with pain. Gingivitis: The inflammation of the gums, the first stage of gum disease, is the easiest to cure. The direct cause of gingivitis is the long-term formation of plaque, a soft, sticky and colorless layer of bacteria on the teeth and gums. If gingivitis causes bleeding gums, loose teeth and tooth decay, if the gingival hyperplasia is particularly obvious, this patient will even sometimes have spontaneous bleeding gums when brushing teeth, if not pay attention to some patients will develop into real periodontal disease, some even have loose teeth or even lose teeth, in this case once pregnant women have periodontal disease during pregnancy, once to pay attention to good care.