Activated charcoal might be abrasive and does not have strong medical support; choose gentle

https://archeruitq354.fotosdefrases.com/in-office-vs-at-home-whitening-which-is-right-for-you-2

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