Your pre-med experience is great! There is nothing wrong with experience. If dentistry ends up being your thing, you can use this experience to show the dental schools that you were open minded about other careers and after investing a good amount of time, you realized dentistry was the best choice for you. With that said you need to show them that you have given dentistry the attention that it deserves from that point on. Personally, I think those who find dentistry after exploring other career options are in a better situation than those who picked dentistry and just stick to it without considering other career options.