After the first root canal treatment, a second one is usually done about 1-2 weeks apart. 1. Root canal treatment is done by drilling holes in the tooth, inserting root canals and filling the canals with medication, mainly used for the treatment of root infection, pulp necrosis, and improving and repairing damaged tooth nerves. Moreover, root canal treatment needs to be done 2-4 times to achieve good dental restoration. After the first root canal treatment, you need about 1-2 weeks interval to do the second root canal treatment. 2. During the period of root canal treatment, it is necessary to take care of the mouth according to the doctor’s instructions, brush the teeth in the morning and evening on time, rinse the mouth in time after meals, and do a good job of cleaning the mouth, so as to avoid oral infections affecting the recovery of the tooth. At the same time, you should also pay attention to your daily diet, try to eat fluids, soft food and easy to digest food, keep light, do not eat spicy stimulating food, do not eat too hard or too sticky food.