Just after scaling, you can eat soft food close to body temperature, such as rice, noodles, and thin rice, etc. Food that is too cold or too hot will cause tooth sensitivity and soreness. Patients with periodontal disease have receding alveolar bone, causing loose teeth. Chewing too hard food after removing calculus will pull the surrounding periodontal ligaments and cause pain. After ultrasonic scaling, slight scratches appear on the surface of tooth enamel, do not eat overly colored food such as chocolate for a short period of time to avoid pigmentation, and food containing too much sugar stays on the surface of tooth enamel will cause demineralization and form shallow caries. A week after scaling the gums will show slight bleeding, you can eat foods with high vitamin C content, such as strawberry, kiwi, etc.