Are you interested in medicine as a medical doctor or are you interested in dental medicine as a dentist? I will be straight forward and let you know that a 2.4 GPA will not get you into dental school. Dental schools have GPA cut-offs, and I don't think your 2.4 GPA is above that. Also, it is important that you raise your GPA. I suggest that you take time to do a Masters or a post-bacc program. This is very common, and dental schools like that you take that option with your low GPA. Re-take your classes as well. Also, a semester of research isn't that much, but I stress quantity over quality. If you dedicated a lot of hours, participated in research symposiums, or anything extra with the one semester of research, then it'll look good. Lastly, it is highly recommended that you shadow a dentist or a dental specialist. Dental schools find it very important that you have an understanding of dentistry. The best way for that is to get some shadowing done. I hope this helps!