"Charcoal toothpaste" refers to a type of toothpaste that contains activated charcoal as one of its main ingredients. It is often used to help whiten teeth and remove stains by absorbing and removing impurities. Full definition
If you experience any of these symptoms, stop using charcoal toothpaste right away and make an appointment with your dentist. (health.com)
I had used charcoal toothpaste before, although only in a paste rather than loose like this one, so I was intrigued to give it a try. (ispyplumpie.com)
And while charcoal toothpaste has always held an appeal, its black hue has typically been a barrier to regular use. (mindbodygreen.com)