The clinical types of gingivitis are as follows: 1. Adolescent gingivitis: caused by changes in hormone levels, manifested as bleeding from brushing teeth, bleeding from biting hard objects, visual examination reveals the presence of more soft scale on the tooth surface, and poor oral hygiene; 2. Ordinary chronic gingivitis: occurs in adults, with a longer duration, mostly due to long-term failure to perform oral scaling and cleaning, resulting in mild inflammation of the gums, manifested as occasional bleeding from brushing teeth and mild oral odor 3, gingivitis during pregnancy: occurs in women during pregnancy, occurs during pregnancy, mostly due to poor oral hygiene, hormone level changes resulting in reduced anti-inflammatory capacity, causing inflammation of the gums, bleeding, severe oral odor; 4, AIDS-related gingivitis: occurs in patients with AIDS, manifested as a red line on the edge of the gums, not easy to produce pain, bleeding.