i went to dr isermann in 2010 for a root canal. this was the second root canal for this tooth and i also had a crown on it as well. dr. isermann had to cut below the gum line and drill into my tooth from the side which saved me the cost of buying another crown. root canals are awful but if i needed another one, i would go back to dr. isermann. i've read other negative reviews of dr. isermann. i'm not sure what people expect. there are plenty of dimwit dentists around, but dr. isermann isn't one of them. i've gone to dentists for over 40 years, i know.