It belongs to gingivitis. The main reason is that the accumulation of dental calculus oppresses the gums and makes them shrink. When the autoimmune function is low, the gums begin to become inflamed, and when the gums become inflamed, symptoms such as redness, swelling and bleeding will appear. This part you are talking about is the gingival papilla, which is usually easier to find when the gums are inflamed.

Take some anti-inflammatory drugs now, and go to a regular hospital for periodontal cleaning (also called tooth cleaning) 2-3 days later. After the formed calculus is removed, gingivitis will be fine. Here's an explanation of why you should take medicine first. Because the bleeding from tooth washing during gingivitis affects the doctor's sight more than the eyes, it is impossible to remove the hidden stones. )

Finally, it is suggested that periodontal scaling should be done once every six months to one year during normal brushing.

The supplement is that you must go to a regular hospital, because some clinics will only remove the stones from the teeth, but the stones under the gums (invisible) will not be completely removed. If it is not completely removed, it will still cause gingivitis in the later stage.