The gap between the teeth is getting bigger and bigger may be caused by periodontitis, need to go through the perfect periodontal treatment to eliminate the gap between the teeth, the specific process includes basic treatment, periodontal surgical treatment, restorative treatment, periodontal supportive treatment, as follows. 1. Basic treatment: Eliminate plaque and tartar on the gums and under the gums through scaling and subgingival scraping, and eliminate other local stimuli to control the inflammation of the gums. 2. Periodontal surgical treatment: thorough root planing under direct vision, and at the same time, trimming the shape of the gums and bone. 3. Restorative treatment: After the inflammation is eliminated and the shape of the gums and the position of the gingival margin are basically stabilized, the gap can be eliminated by full crown restoration or orthodontic treatment. 4. Periodontal support therapy: This includes regular checkups and retreatment to maintain periodontal healing. It is recommended to go to the hospital in time to receive regular treatment as early as possible.