nah. rarely is an undergrad doing any research that is directly pertinent to dentistry anyways. i'm in a neurobiology lab, so sort of similar. there's a certain analytical way of thinking that you develop when you research, and particularly when you land your own project. it's that analytical way of thinking they are looking for you to develop. sure, it might look better were it in bio, chem or physics...but if this is your only option, then go for it and learn as much as you can while you are there! 🙂