You can brush your teeth for the first sealing after root canal treatment, but be careful not to use excessive force to prevent the sealing material from falling off. Brushing will not affect the inside of the root canal after the first sealing, you can brush your teeth and rinse your mouth, but be careful not to dislodge the temporary seal. If the temporary sealing material falls off, you need to go to the hospital as soon as possible to re-seal the temporary sealing material. At the same time, brushing needs to be effective, and the surface of the tooth should be carefully cleaned of soft tartar and food debris. In addition, because the tooth is undergoing root canal treatment, the diet needs to pay attention to, do not eat too cold and too hot to stimulate the tooth, you can eat some soft and nutritious food, such as millet porridge, vegetables and so on. After root canal treatment, you need to follow the doctor’s instructions, and any pain or discomfort is recommended to consult a doctor as soon as possible.