Teeth will be loose, there are mainly the following three reasons: 1, but also the most common reason is periodontitis, periodontitis is that it will make the alveolar bone shrink, the gums will also appear to recede, so that the teeth are like trees that have lost their soil, and over time there is looseness; 2, long-term untreated teeth with caries, once the development of the degree of periapical periodontitis, the alveolar bone is also subjected to severe stimulation, and gradually Resorption occurs. Inflammation is not effectively treated, and over time, loosening and loss will also occur; 3, the teeth have been traumatized, impact, and may also be loosened, or even shifted. If there is a loose after, early can take the loose teeth fixed way, but if the teeth loose more than three degrees, or as early as possible extraction, re-restoration is better.