Bleeding from tooth brushing is a very common clinical symptom. Many people experience this symptom at irregular times, and the most common clinical disease that causes bleeding from brushing is gingivitis. Gingivitis is due to poor periodontal hygiene, the presence of a large amount of plaque and calculus, and these plaque and calculus attached to a large number of bacteria, long-term growth, the formation of inflammation of the gums, gingivitis is typically manifested by the redness, swelling, flaccidity and bleeding of the gums. The most common manifestation of this bleeding is bleeding under stimulation, which is generally felt as bleeding from brushing and bleeding from biting on hard objects. Bleeding from biting on hard objects means that when the patient eats, for example, an apple or a pear, the corresponding blood stain remains on the fruit. For this case of bleeding under irritation. The best treatment is to go to a professional dentist for scaling treatment. Scaling can remove plaque and calculus from the periodontium to achieve a healthier periodontium, and most patients with gingivitis will get significant relief from gingivitis after scaling.