raw al, there might be a tiny bit of the clay absorbed by my mouth, but the intent is to very lightly brush and then spit it out. i think the only reason you would have to worry about clay causing anemia is if you were to take it every day because i think the minerals that make clay sticky and slick would interfere with proper iron and other cofactor absorbtion. which can happen if you are overeating anything.
my teeth are also healthy and with no pain, but they did get pretty brown looking after years of drinking tea only brushing very lightly with water. the only time they were in pain is when my weight was too low from blood sugar issues and my body started to eat its own parts, and also if/when I eat fruit or lemons, those seem to just eat away at my back molars. they have definitely stop degenerating and my teeth and gums seem stronger then they used to.
like i said, it only takes a few light brushes and is easy to get the stains off, i am sure there would be some erosion of enamel if one where to brush like mad, so don't do that.