Why would you not apply for the job? Any exposure to the dental field before entering school will be a huge leg up for you when school gets into swing. I am currently working at a dental lab. I started at an entry level position, not front office though. Over the last year I have been able to work myself into a dental lab tech position where I wax crowns and veneers, and work on the porcelain restorations. I have learned a ton from it, and I know it will be a huge benefit for me when I go to dental school. Even just being around the work going on at a lab will teach you things you probably won't learn in dental school, or will help you understand your lab work once you do start school. If the lab you are applying to is anything like mine, then if you show a lot of interest in actually working on the restorations, they will probably be willing to start teaching you.