I’ve never heard of activated charcoal for stain but I’m very interested if it works! I have a patient that has such heavy staining every 6 months from coffee. I’ve tried suggesting everything I can think of to help and the patient is trying their best also with no results.
This particular patient buys it in capsule form at a local health food store, opens capsule and pours charcoal on toothbrush. Brushes with this 3x week.
I’ve watched a youtube video on it. The purpose is to remove stain and whiten teeth. I haven’t personally tried it.