If the interior of the tooth has been infected, a root canal treatment is absolutely necessary to ensure the health of your teeth - and the rest of his body. The average cost of a root canal treatment may vary from 265 - 600 for a front tooth, and from 375 do - 860 for a molar.? The cost covers drilling of a small hole in the affected tooth, the Elimination of infected pulp, and replace it with clean fill.