The gap between the incisors is getting bigger and bigger, may be caused by bad dental habits, may also be caused by disease factors, it is recommended to consult a doctor to identify the cause, in order to facilitate follow-up treatment. 1. Bad dental habits: daily habitual tongue licking against the incisors, or frequent use of hard toothpicks picking gap, although it can clean up food debris or soft dirt, but will expand the gap. 2. Bite problems: the upper and lower incisors bite deeper together, chewing or closing the mouth will inevitably collide, the upper incisors are more likely to be the lower incisors outward and upward upward, may also expand the gap between the incisors. 3. Osteoporosis: Mostly seen in the elderly, due to low calcium absorption and utilization, the whole body osteoporosis, will also affect the jawbone as well as the dentition, the incisors become larger. 4. Dental calculus: oral hygiene fails to maintain, dental calculus accumulates in the gap for a long time, not only in the incisor gap, but also in the adjacent gap in the other teeth will be accumulated, when the oral scaling surgery will clean up the tartar, you will find that the gap between the teeth become larger.