A human being normally has 28 to 32 teeth, and the removal of individual diseased teeth does not have a significant health impact, unlike other organs of the body where removal or loss of function can have a significant health impact. Loss of function of other organs in the body such as blindness, deafness, poor movement of limbs, etc. would be considered a disability, but no one would ever consider a person with missing teeth as disabled! Tooth extraction is a common treatment for dental diseases. When a tooth lesion is too severe for treatment to be effective or untreatable, timely extraction is necessary to prevent the spread of inflammation to the healthy teeth or mucosa or periodontal tissues surrounding the diseased tooth. In addition, it is necessary to restore the form and function of the missing teeth by placing dentures in time after tooth extraction to avoid harming the soft and hard tissues of the mouth. The common cases that require tooth extraction are as follows: 1. The dental lesion is too serious to be treated or the treatment effect is not good. For example, tooth decay leads to rotten teeth with only roots left, which cannot be repaired due to too little tooth tissue left, and often only extracted and then set dentures. In addition, if the periodontal disease causes the teeth to be too loose, it must also be extracted, so as to prevent the periodontal disease from spreading to the next healthy teeth and causing the neighboring teeth to be loose. 2, wisdom teeth: also called obstructive teeth, commonly found in the third molar of the lower jaw bilaterally. Due to the lack of position, the tooth often can not grow smoothly, tilted forward, on the inside of the second molar in front. Wisdom teeth have two dangers: First, they cause repeated inflammation of the soft tissue around the tooth (called pericoronitis in dental terminology), repeated swelling and pain, and in severe cases, infection and swelling of half of the face. Secondly, it causes the second molar adjacent to the front to produce caries. These two cases are very common in the clinic. Therefore, if you have wisdom teeth, you should go to the hospital for examination as soon as possible, and if the doctor suggests you to remove them, please do not hesitate to remove them as soon as possible. 3.The need of orthodontics. Due to the progress of society and the improvement of material living standards, people have higher requirements for dental aesthetics, and more and more teenagers are having orthodontic treatment. At this time, parents often find that the doctor will require the extraction of teeth before orthodontic treatment. Many parents do not understand: I am here to correct my teeth, why should my child’s teeth be extracted? This is because parents do not understand the principle of orthodontics. Misalignment or malocclusion is often caused by a mismatch between the amount of teeth and the amount of bone in the socket. The amount of bone does not vary much, so it is often necessary to adapt the amount of teeth to the amount of bone, i.e., extracting teeth. The extraction at this point will not only cause no harm or decrease in chewing function, but will also ensure a stable outcome of orthodontic treatment. Therefore, if your doctor recommends that your child have teeth extracted for orthodontic treatment, please do not be afraid or have doubts, provided of course that you meet a qualified orthodontist who has given you the right treatment plan. In conclusion, teeth should be protected to the best of your ability, and a healthy tooth is a healthy whole body. However, please do not be afraid once you have to have your teeth extracted, it is not scary!