I would probably apply to as many schools as I could that do not have a cutoff for DAT or specifically RC scores. I know some schools really like RC scores and I'm sure a few don't put too much weight in it. You have above average GPA and an average DAT score, so I think you have a solid chance. Applying is like playing the lottery - the more tickets you buy, the better the chance you have to win and having an above average GPA is like buying some of the pricier lotto tickets with one of those guaranteed winner every 10 tickets.
If you retake, my personal opinion on this (got a 25 on RC) is to do a few practice tests and be honest with yourself. You know your strengths. Are you good at search and destroy? Do you need to read every word? Also, don't stress about it. My opinion is that the RC serves two purposes: one is that your efficient at scanning through dense scientific material that you may know nothing about and pull out the meaningful stuff in a short time period (as you won't have enough time to read EVERYTHING in dental school) and two it's a mental thing. The RC is toward the end of the DAT - after a long grueling test that you've been prepping several weeks in advance for. Trust your preparation and have confidence going into RC. Trust your instinct and first answer.