If you did well in your english/composition or any other classes that involve reading comprehension as an undergrad, don't even worry about your RC score. ALL Dental schools will forgive it considering you did stellar on all other sections if you did well in your undergrad studies.
You should do what Bruin said though. Contact the schools and talk to them about it, see if they advice you to retake, although I'm 100% sure that they will not ask you to retake it if you did well in classes that are similar to RC as an undergrads.. so be sure to tell them how you did as an undergrad when you talk to them.
Don't worry too much. Your scores are really really good, I'm positive you will get a few invites.