Patients may often hear the doctor tell you, “You have a wisdom tooth” or “You have an impacted tooth” and so on, and then you often wonder, “What is a wisdom tooth? What do you mean by “wisdom tooth?”? Wang Rong, Department of Oral and Maxillofacial Surgery, Shandong University Stomatology Hospital In fact, wisdom tooth is the “eighth tooth” in our mouth, how does this eighth come about? You can look in the mirror and count backward to the center line of the incisors, the incisors are the first, the cuspid is often called the third tooth, counting to the eighth is what we call the wisdom teeth, also known as the third molar. Wisdom teeth generally erupt after the age of eighteen, that is, after the adult, which is the reason why it is called wisdom teeth, some people wisdom teeth because of the lack of jawbone bone can not fully erupt or completely can not erupt, we can commonly understand that “the teeth are buried in the bone”, which forms the buried teeth that we often hear that obstructed teeth. Wisdom teeth are the most common obstructed teeth, and any tooth other than the wisdom teeth can have incomplete eruption due to various local undesirable factors to form an obstructed tooth. If your child is changing teeth at home, you must pay enough attention to prevent the permanent teeth from being blocked due to untimely loss of baby teeth. Obstructed teeth can cause a lot of harm to the patient and should be detected and treated early. Obstructed or incompletely erupted wisdom teeth can repeatedly cause local swelling and pain, chewing discomfort, bad breath, tooth blockage, decay and even loosening of adjacent teeth, and some can also form local osteomyelitis and cysts. Women who are pregnant are more prone to inflammatory reactions of wisdom teeth because of the change of hormone level and lower resistance, so it is recommended to go to the hospital in time to deal with or remove the blocked wisdom teeth. Women who are planning to get pregnant should prepare in advance. On the other hand, if your wisdom teeth can fully erupt and form a good bite relationship to form a normal chewing function, you must keep the wisdom teeth well. Because the wisdom teeth are relatively backward, it is difficult to clean them thoroughly with a normal toothbrush, so you can use a small-headed soft-bristled toothbrush to brush them carefully to avoid decay.