Key Takeaway
Activated charcoal toothpaste did not produce clinically meaningful whitening compared to conventional toothpaste in a randomized controlled trial over 4 weeks of use.
Summary
This single-blind randomized controlled clinical trial directly tested whether activated charcoal-based toothpaste products deliver meaningful teeth whitening results compared to conventional toothpaste. Participants were randomly assigned to use either a charcoal-containing toothpaste or a standard toothpaste over a defined study period, with shade measurements taken at baseline and follow-up.
The results showed that activated charcoal toothpaste did not produce clinically significant whitening effects compared to the control group using conventional toothpaste. While some minor color changes were observed in both groups, the differences between charcoal and non-charcoal products were not statistically or clinically meaningful.
This RCT provides important clinical evidence complementing the existing in vitro data, confirming that the whitening claims commonly made by charcoal toothpaste manufacturers are not supported by rigorous human trials. The study adds to growing evidence that consumers may be paying a premium for charcoal dental products without receiving the promised whitening benefits.