If the gums and tooth tissues are completely normal, this condition of tooth loss will not occur. If a tooth falls out and tooth loss occurs, there are several reasons to consider. The first reason, stimulated by trauma, in the case that the tooth is stimulated by external force, it is possible to have such a situation where the tooth is loose and falls out. If the condition allows, it is better to replant the lost teeth; the second cause, periodontitis, a bacterial infection disease, after the periodontal tissues around the teeth have a very serious inflammation, it will lead to alveolar bone resorption, gum atrophy, and slowly loose teeth, loss of teeth. The third reason for tooth loss may be the presence of tumors in the jawbone, such as enamel cell tumors and cysts in the jawbone, which may lead to loose teeth and loss of teeth.