Dr. Reese is a SMART certified dentist. Here is the link to the IOAMT website explaining what a SMART certified dentist does and the precautions taken to remove amalgam/mercury fillings:
In addition, she has implemented all of the equipment changes necessary to become certified which include an amalgam/mercury separator which eliminates mercury from the water discharged in to waste water. It is estimated that 28 tons of mercury from dental offices are released into the environment per year. This is why Dr. Reese is so adamant about having the equipment that eliminates this from her office waste water!