Wisdom tooth checkups are indispensable for women before pregnancy because a small dental disease can cause big problems for the mother and child, and can even be life-threatening in serious cases. Recently, a pregnant woman was admitted to the hospital for surgery because of an inflammation of her wisdom teeth, which led to multiple facial infections and the inability to open her mouth for food. It turned out that Lin’s lower left wisdom tooth gums began to swell and hurt a month ago, and she could only eat liquid food. In January, the swelling of her left face became more and more severe, the pain increased, the opening of her mouth became smaller and smaller, and she had difficulty breathing. After examination, the pregnant woman’s left face, submandibular and parapharyngeal swelling was obvious, which was a multi-gap infection of the interbite, submandibular, pterygomandibular and parapharyngeal gaps, requiring immediate abscess incision and drainage, otherwise it might lead to sepsis, septicemia or jaw necrosis, or even asphyxia. Since the treatment was still timely, the inflammation of the pregnant woman was effectively controlled, and the facial swelling and pain gradually resolved. Although the treatment tried to use drugs and treatments that have less impact on fetal growth and development, there is still a possibility of adverse effects on the development of the fetal nervous system and some organs. Finally, the pregnant woman had her 5-month-old fetus induced at the advice of her obstetrician and gynecologist. Wisdom teeth, also known as third molars and posterior alveolar teeth, are the last teeth in the mouth, with four upper and lower teeth, and are called “wisdom teeth” because they erupt around the age of 18-30. Since the evolution of human bones is faster than the evolution of teeth, when our upper and lower jaws were already much smaller than those of apes, the number and size of teeth had not changed much and there was often no room for wisdom teeth, so almost everyone’s wisdom teeth grow crooked. Because of its backward and crooked position, it is often impossible to brush clean. Clinical experience shows that most of the caries occurred in the teeth next to wisdom teeth are related to wisdom teeth. In the dental clinic, we often see pregnant women come to the clinic because of wisdom tooth inflammation. Because the hormone level in the body will change after pregnancy, the gums are more likely to be inflamed, and even the wisdom teeth that are not normally inflamed may be inflamed at this time. This is why many pregnant women have red and swollen gums and inflamed wisdom teeth during pregnancy. In the first and second trimesters of pregnancy, it is not advisable to perform tooth extractions or to take medication indiscriminately, so doctors are often at their wits’ end when it comes to wisdom teeth pericoronitis in pregnant women. Therefore, prevention of pericoronitis in pregnant women is important. You should pay attention to cleaning tartar after pregnancy, rinse your mouth with salt water every day, and avoid or reduce the occurrence of pericoronitis in wisdom teeth by not eating spicy, oily, and other foods that can easily get inflamed. Of course, it would be more reassuring if you could have a dental checkup before pregnancy to prevent and treat any potential pathogenic factors. Unfortunately, many people are quite unfamiliar with pre-pregnancy dental check-ups. Statistics show that a staggering 80% of mothers-to-be in their sixth month of pregnancy have periodontal disease. These pregnant women with periodontal disease are three times more likely to deliver prematurely than normal pregnant women, and in severe cases can even cause miscarriage. Therefore, we suggest that women should go to a regular hospital to have their wisdom teeth checked, remove any hidden wisdom teeth as soon as possible, clean their teeth, and get rid of calculus and plaque before preparing for pregnancy.