For bleeding mouth and bad breath, it is recommended to check whether there is a large amount of caries in the oral cavity and the phenomenon of food embedding; in addition, check whether there is a large amount of calculus and plaque around the gums, and whether there is redness, swelling and pus in the gums in this case. Usually, you can scaling to remove the calculus and plaque, the gum can be slowly restored to health; and appropriate use of periodontal drugs, such as iodine glycerin or minocycline hydrochloride, local application around the gum, has the effect of inhibiting the development of bacteria; also can use mouthwash, such as compound chlorhexidine rinse or compound tinidazole solution, etc. Usually, if the mouth has bad smell and caries, it should be treated in time. In addition, if the oral environment has been well maintained, it is recommended to check the gastrointestinal tract function disorders, should be timely treatment, can also reduce the phenomenon of bad breath; and it is recommended to regular diet and nutrition, healthy diet, appropriate exercise, do not stay up late, so as to avoid the phenomenon of bad breath.