Many people do not take dental disease seriously and do not treat “worm teeth” (caries) in time, resulting in most of the teeth being damaged, and some people easily pull out the remaining roots. For many years, people think that it is a logical thing to remove the “rotten tooth roots” in the mouth and then insert teeth, but in fact, it is not. What is the purpose of the residual roots that have become defective due to tooth decay, trauma or abrasion? Dental experts point out that with the development of medical technology, tooth residual roots should be preserved as much as possible, and it plays an important role in oral restoration. First of all, the preservation of the residual tooth root is beneficial to maintain the bone tissue around the root. A normal tooth root is surrounded by a thick layer of bone tissue. When a tooth is extracted, this bone tissue slowly shrinks and decreases in height as it loses its dependency. Some elderly patients have all their teeth extracted and the bone slowly becomes low and flat, which is bad for full dentures and can lead to unstable dentures and inability to eat. At the same time, the lips collapse and the face looks old because the bone in the front of the mouth is absorbed. Secondly, there are many receptors around the roots of the teeth, and their function is to feel the pressure from chewing food, and these pressure messages make us feel the “pleasure” of chewing. Once the roots are removed, the receptors disappear, which means that the pleasure of chewing no longer exists. This innate receptor is very valuable and is a non-renewable resource at the current state of technology, so it is best to keep it until the root is broken. Once again, the roots located at the back of the mouth can provide the necessary support for the removable dentures. When the removable dentures chew food, the chewing force can be transferred to the hard roots instead of loading directly onto the soft oral mucosa, which can avoid the problems of pain and instability after setting the removable teeth. The integrity of teeth is an important guarantee for improving the quality of human life and even for a long and healthy life, and should be cared for as much as the eyes. Therefore, we remind our elderly friends that once they get dental disease, they should seek treatment from a regular hospital dentist in a timely manner, especially for tooth extraction, they must be cautious, as long as there is hope for preservation, do not give up, do not easily pull out the roots.