Patients with periodontitis should seek treatment in the periodontal department. If there is no periodontal department available, they can visit the department of oral medicine, or the department of stomatology or otolaryngology. Periodontitis is an inflammation of the periodontal support tissues, including gingivitis and periodontitis, with gingivitis being the early stage of periodontitis. It mainly occurs due to not brushing or rinsing promptly after eating, leading to the accumulation of food residues around the teeth. This condition requires timely teeth cleaning to remove these residues, otherwise, it could cause bleeding during brushing or eating and may further develop into periodontal pockets, leading to the appearance of periodontitis. Periodontitis might also involve the loss of alveolar bone support tissues, which requires timely dental cleaning followed by medication or a guided bone regeneration procedure.