What happened to the gums coming away from the teeth?

Gums detached from the teeth may be caused by gingivitis, periodontitis and other diseases, as follows.
1. Gingivitis: chronic gingivitis, tissue edema, gingival margin thickening, no longer close to the surface of the teeth, the gingival sulcus probing depth over the healthy gingival sulcus probing depth of more than 3 millimeters, but there is no loss of attachment and alveolar bone resorption.
2. Periodontitis: When suffering from periodontitis, the gums are bright red or dark red, edematous and floppy, and may have different degrees of enlargement or even hyperplasia, accompanied by loss of attachment and alveolar bone resorption, resulting in the gingiva detached from the teeth.
There may be other reasons for the gums to detach from the teeth, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease for targeted treatment.