Crowns are not easily dislodged after root canal treatment. Crown loss is not causally related to root canal treatment. Crown restoration is a common means of restoration. After root canal treatment where the tooth is weak and sensitive, crown restoration can prevent the tooth from splitting and at the same time protect the tooth and prolong its service life. Dental crowns generally do not come off after they are fitted because they are fixed with professional adhesives, as long as the doctor operates correctly and pays attention to their use in general. It is important to note that within 24 hours of the crown bonding do not use that side to chew food, so as not to dislodge the crown due to incomplete curing. Oral hygiene should also be maintained to prevent secondary caries. If the crown is accidentally lost, it is necessary to go to the hospital in time to check the condition of the lost crown, in order to effectively minimize the impact of missing teeth. It is recommended that the crowns should be checked regularly according to the doctor’s instructions, and if there is any abnormality, it is necessary to consult the doctor in time.