Root canals typically last about 5-10 years, but may only last about 1-2 years if the patient fails to take good care of the tooth after treatment. The tooth is vulnerable after root canal treatment because the tooth is not supplied with nutrients from the pulp, at which point it may splinter. If the patient carefully cleans his/her mouth daily after treatment, pays attention to the condition of the tooth, and has an artificial crown to protect it, it can usually last about 5-10 years. If the patient fails to take good care of the tooth and clean it after treatment, there is a high risk of splitting, which can last about 1-2 years. Therefore, it is important for patients to take good care of their teeth after root canal treatment and do a good job of cleaning their teeth on a daily basis.