Crowns can usually be made about 7 to 14 days after a root canal, and no later than one month, or there may be an increased risk of crown fracture. 1. After a tooth has undergone root canal treatment, as the nerve has lost its activity, the tooth loses its nutrient supply, so its brittleness increases, and you need to grind the tooth down to make a crown to cover it in order to prevent the crown from fracturing and other problems. 2. Generally speaking, after completing root canal treatment, due to the stimulation of the root filling material, the tooth may be slightly swollen for a short period of time and other discomforts, therefore, it is necessary to observe for 7 to 14 days until the tooth apical inflammation is basically eliminated, the fistula heals, and there is no pain and discomfort and other symptoms, and then it is possible to consider making a dental crown. 3. But some teeth due to inflammation range is too large or root canal filling material beyond the apical hole, the tooth root canal treatment may appear after the symptoms of persistent pain, it is best to go to the hospital for follow-up examination, diagnosis of the cause of the disease may need to carry out a second root canal treatment, to determine the tooth without significant discomfort, before the crown restoration. Therefore, it will take 7 to 14 days, or even a month, after root canal treatment before a crown can be made.