each school is different when it comes to considering the weights of GPAs. there are numerous other threads started that rank schools based on GPAs of enrollees. some schools have high sci gpa but lower overall and vice versa. on the other hand some schools have low gpa but higher DAT scores.
but to answer your question in a general way, your science courses will have the most weight: orgo, chem, bio, physics. those are what compose your BCP gpa. i would have to say a C in an elective course like history would not be weighed upon as heavily as a C in bio 2 by dental schools. next, would be other science gpa, and lastly overall. in dental school your classes are mostly science based, hence the emphasis on science related GPA.