Bleeding teeth from eating apples is a common clinical complaint of patients, and the most common cause is gingivitis. Gingivitis is caused by poor oral hygiene and the presence of large amounts of plaque and tartar around the teeth, which provides a breeding ground for periodontal bacteria and over time leads to gingivitis. The typical symptoms of gingivitis are redness, swelling, flaccidity and bleeding of the gums. The most common manifestation of bleeding is bleeding under stimulation, including bleeding from brushing teeth and bleeding from biting hard objects, and bleeding from biting hard objects refers to the phenomenon of blood stains appearing on apples or pears when biting hard objects, such as apples or pears, which are caused by gingivitis. For gingivitis, the best treatment is supragingival scaling, i.e. scaling treatment. Most patients with gingivitis will have their bleeding gums significantly relieved, or even completely cured, after scaling.