Root defects can be salvaged as long as they are not too deep, but it is important to emphasize that a root defect, which can be understood as a defect in the neck of the tooth, is the most stressed part. Half of the tooth is in the bone and half is in the mouth, and it will twist when it is stressed, and the most critical location for twisting stress is the cervical part of the tooth. If the defect is relatively shallow, it can be treated by filling in the dental department. If the defect is deep and involves the dental nerve, after the dental nerve is treated in the dental department, a pile crown restoration is needed in the prosthodontics department. If you look at the cervical part of the tooth as a circle, if a large part of the circle 360° has been defective and only a line is left connected, it may miss the treatment time and need to be extracted, so it should be treated before it is too late. In addition, the root defect of the tooth needs to be prevented and treated as early as possible, including two aspects: firstly, you should avoid eating too hard food, because the harder the food you bite, the greater the stress concentration on the tooth will be, and there will be more local chipped defects. Secondly, you need to pay attention to the change of brushing method, you should pay attention to brush your teeth not horizontally, like pulling a big saw, use vertical brushing method, use soft bristle brush with small circles, the most professional point is to use the Bachmann brushing method. When you brush your teeth, don’t only focus on the beautiful lip and cheek surface, but also brush the lingual side to avoid the lingual cervical defect, which needs attention.