Redness at the root of the gums is usually due to inflammation at the root of the gums caused by the reaction, the disease includes gingivitis, periodontitis, periapical periodontitis and so on. 1. Gingivitis: the main cause of gingivitis is infection caused by plaque, if not treated in time, the infection will continue to spread and involve the surrounding tissues, if the lesion spreads to the root of the gums will cause redness at the root of the gums. It is recommended to actively treat the primary disease and eliminate the inflammation. 2. Periodontitis: Periodontitis is a chronic inflammation that occurs in the periodontal tissues, the inflammation will spread to the alveolar bone, gums, bone, and even involve the soft tissues around the gums, resulting in redness, swelling and pain of the gums, or even loose teeth, etc., and it should be treated actively to avoid adverse consequences. 3. Apical periodontitis: Apical periodontitis refers to the bacterial invasion of the apical part of the root of the tooth bone, periodontal membrane or alveolar bone, resulting in inflammatory reaction of these parts, chronic apical periodontitis symptoms are not obvious, more difficult to detect, and may be manifested as redness of the gums at the root. There may be other reasons for the redness of the roots of the gums, it is recommended to go to a dental specialist in time for a clear diagnosis and treatment for the cause of the disease.