If the gums are swollen all the time in the whole mouth without timely treatment, it suggests that the tooth is suffering from periodontitis. In patients with periodontitis, if the source of infection around the tooth persists, this inflammatory stimulus will cause the alveolar bone to gradually resorb, causing the alveolar bone to become very low and flat, resulting in the length of the tooth root in the alveolar bone becoming shorter and shorter, until the tooth gradually loosens and falls out, and many patients with severe periodontitis have loose and lost teeth due to periodontitis. If a tooth has localized redness and swelling of the gums, most of the time the tooth is suffering from chronic periapical periodontitis, the tooth with periapical periodontitis should also be treated promptly, using root canal treatment to remove the source of infection in the root canal cavity to control and eliminate the periodontal inflammation, if not treated, the inflammation in the alveolar bone will continue to exist until the formation of periapical granuloma, periapical abscess, or even periapical periapical cysts.