Up to you but I say no need. I have a few C's on my report card and still got accepted to dental school. I'd think they'd prefer better sciences grades over math. Just be ready to explain if they ask.
well... isn't C the bare minimum required grade for any pre-dental course? Its been 3 years since I apply'd, I don't remember all the details, but I think bare minimum was C then (and still is)
no need for retake... its far more important to focus on overall GPA than a single class retake.