Precautions after root canal treatment are as follows: 1, avoid biting too hard food: such as ribs, beer bottle caps, etc.; 2, regular review: for patients with pulpitis and periapical periodontitis after root canal treatment, it is recommended to follow the doctor’s instructions and visit the hospital every 3 or 6 months for regular review and take dental films to follow up the internal condition of the tooth; 3, wear protective measures: such as crowns and inlays, after root canal treatment patients’ teeth are more brittle and prone to cracking, it is recommended to Wear protective measures to avoid cracking of the tooth. If the affected tooth is cracked, with the current medical technology, the only option is to extract the affected tooth.