The reasons why teeth bleed all the time include the following: 1.Poor oral hygiene cleaning, food, residue, soft scale and so on retained on the teeth combined with saliva to form calculus, stimulate the gingival capillary hyperplasia, brittleness increases, can produce blood oozing when brushing and eating. 2.When suffering from puberty or pregnancy gingivitis, the body hormone level is high, soft tissue capillary permeability increases, can appear gingival papillae congestion, swelling, produce blood oozing. 3.When suffering from white cavity pulp cavity open for a long time, the pulp tissue produces chronic hyperplasia to form polyp, chewing easily bite through the polyp, produce a lot of blood oozing, 3.When the pulp cavity of the long-term unrepaired cavity is open and the pulp tissue produces chronic hyperplasia to form polyps, it is easy to bite through the polyps during chewing and produce a lot of bleeding. 4.When suffering from leukemia, the gums of the whole mouth are generally swollen and have a tendency to bleed spontaneously, and the gums are widely eroded and bleed more than once.