Occurs in the interdental papilla and gingival margin on the lip side of the anterior teeth. The labial gingival margin is obviously swollen, the papilla is spherical, the gingival color is dark red or bright red, bright, and the texture is soft. The gingival pocket is formed, and it is easy to bleed on probing. Patients generally have no obvious symptoms, or have bleeding when brushing their teeth, biting hard objects, and bad breath.