What are the causes of tooth bleeding?

Most gum bleeding is caused by the accumulation of local dental calculus and plaque, which will press the gums for a long time, causing inflammation of the gums, showing symptoms of redness. In the case of biting hard objects, brushing teeth or even without any stimulation, there will be bleeding. Gum bleeding to rule out some systemic diseases, blood disease caused by gum bleeding to do blood tests.