Activated charcoal may be abrasive and does not have strong medical support; pick gentle

https://blogfreely.net/dernesvhbz/the-fact-about-charcoal-toothpaste-does-it-really-whiten

Activated charcoal might be abrasive and does not have strong scientific assistance; select mild, peroxide-based alternatives to avoid scratching enamel and causing level of sensitivity.