The main symptoms of periodontitis include: 1. Inflammation of the gums, which may present as bleeding, swelling, and a soft texture. Patients may experience bleeding while brushing their teeth, biting into hard objects, or even spontaneously. 2. Formation of periodontal pockets, where ongoing inflammation can lead to the development of periodontal pockets, resulting in the loss of periodontal attachment and causing bad breath. 3. Resorption of the alveolar bone, which can lead to weakened chewing capability. 4. Loose teeth, shifting of teeth, or even tooth loss, accompanied by secondary jaw trauma, gum recession, increased space between teeth, weakened chewing capability in the molars, fan-shaped spreading of the anterior teeth, periodontal abscess, food impaction, root caries, tooth sensitivity, etc. Therefore, it is important to maintain oral hygiene by brushing teeth morning and evening, rinsing after meals, and regularly visiting a dental department at an accredited hospital for teeth cleaning and periodontal care.