When you have a tooth blister in your mouth, the first thing you need to do is to find out what kind of disease the blister is. If it is a pustule with pus overflowing inside, it is likely that the tooth has apical periapical inflammation and needs timely root canal treatment. If the blister is hard, touch the inside like bone growth, it is likely to be alveolar bone growth. Alveolar bone growth can be left untreated if it does not affect normal activities in the mouth. If it interferes with tongue or buccal mucosal movement, or if it interferes with the restoration of teeth at a later stage, the alveolar bone can be trimmed. For children, it may be the eruption of a new tooth, which parents need to observe closely.