grade problem with C-

Im trying to apply for dental schools but I realized most of them require C or better scores. I had one C- for general chemistry 1 in my freshmen year but the university does not allow to retake because C- is a passing grade.

What should I do?? Should I take an online class to fulfill the requirement?

I am not sure if it would do any good, but you can take the course at a community college. However, the C- will still be in your university transcripts and will hurt your dental school chances. Getting a C or C-, especially in an important course such as chemistry might basically preclude you from getting into dental school. You might be able to overcome this by getting A’s in most of your other science courses, organic chemistry, physics, biology, bio chem, and calculus. Otherwise, consider changing majors.