How long can a tooth filled after root canal treatment last?

After root canal treatment, as long as the root filling is tight and there is no residual soft tissue in the root canal, it will generally last 3-5 years less than a normal natural tooth. The root itself will have the phenomenon of shortening year by year, if a normal natural tooth life in 60 years, it will be in about 50 years. As far as the material of the filling being good or bad has nothing to do with its lifespan, it's best to get a crown after a root canal to prevent the tooth from splitting. After all, there is a greater chance of premature tooth loss due to tooth splitting than root resorption.