Posterior groove teeth can be extracted and all teeth in the oral cavity can theoretically be extracted, but it is also important to understand some common contraindications to tooth extraction. The most common clinical contraindication is pericoronitis, which is caused by the inability of the posterior groove teeth to erupt. In the acute phase of pericoronitis, tooth extraction is not recommended because the acute phase of pericoronitis can cause the spread of inflammation and infection, resulting in bacteremia and even sepsis, which can be life-threatening, so it is generally recommended to extract teeth when you are in good health. In addition, patients suffering from certain systemic diseases are also at greater risk of tooth extraction, such as more serious heart diseases, patients with cardiac function grade III or above or heart attack, heart attack occurring within 6 months, patients with acute blood diseases, such as acute leukemia, which are relatively contraindicated for tooth extraction, and it is recommended that these primary diseases be treated to a certain stable period before tooth extraction is performed.