There are many people with a fear of the dentist. However, even if you’re not one of them, here’s something you should be afraid of: filling your own cavities. But that’s just what the new product Dentidrill invites you to do: fill cavities at home, hopefully not on yourself, but on other family members. This device doesn’t have approval from the FDA, and it may not need it. After all, it is just another drill, similar to other drills that have been marketed for years, so it may slip by without any need for approval, possibly not even a “substantial equivalence” test.