Yes, just keep track of them youself. When you fill out your aadsas application there is a space for the dentist's name, address, and hours spent (in whatever capacity).
It gets a little hairy when you have to compute the 'hours' spent when it has been a long time, for example I worked with a dentist for about 2 years, for several hours each day, it ended up being some ridiculous number. Weird system, but it works I supppose.