After root canal treatment, incisors generally do not shrink, but over time the tooth may become blackened and discolored, or split. 1. After root canal treatment, incisors will become weaker due to the loss of nutrient supply, which will make the tooth blackened and discolored over time, and if the stress concentration is caused inadvertently during eating, the tooth may be cracked. 2. In order to avoid the occurrence of the above situation, the tooth after root canal treatment to observe two weeks, if there is no pain and discomfort, it is best to repair the tooth crown. On the one hand, it can prevent the tooth from splitting, and on the other hand, it can restore the beauty of the incisor. After root canal treatment of incisors, it is best to follow the advice of professional doctors and have crowns restored in time to restore the beauty of incisors. If you experience any discomfort, please visit the hospital in time.