Dentists and other medical practitioners have issued warnings to people following a DIY whitening procedure that makes use of charcoal-derived mixture on teeth.
The product is said to whiten the teeth after brushing for 3 to 5 minutes. In the video espousing its properties, the product is touted as highly absorbent and absorbing all toxins, bacteria and staining on the teeth. It can be bought from health food stores or online in capsule form.
According to the dentists, the method leads to the deterioration of tooth enamel and tooth erosion — permanent damage.
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http://www.foxnews.com/health/2016/08/15/dentist-warns-against-charcoal-teeth-whitening-trend.html