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Seriously it makes me feel like I've taken a disc sander to them, in a good way. So smooth.

Actually, a disc sander isn't the most enticing thing to compare something that goes on your teeth.

Which ... sort of leads into the question of whether tooth brushing can damage tooth enamel. Can it?

I would think any dentist would say no. Enamel is REALLY hard, but is damaged by the stuff that tooth brushes remove.