W.P.
I have never heard of that either. My son(sadly) needed a bit of dental work done when he was young and I was with him all the time. I can recommend an excellent pediatric dentist in downtown Chicago-Joanne Kromash Oppenheim, Pediatric Dental Assoc. on Michigan Ave. I think you may be right about the drilling but it may depend on the cavity, etc. Good luck! (I see another poster recommended her as well)