Sounds interesting…I found an article with the details, but here’s a sample:
A patent application that recently became public record reveals the Colgate-Palmolive Company is researching technology that would allow chemicals to be embedded into the heads of standard toothbrushes and slowly released during use.
A three-month supply of caffeine could be embedded into the tongue-scraper on the back of a toothbrush, the application reads. So could doses of aspirin. Or benzocaine, for teething babies. Or, it expressly states, appetite suppressants. Colgate wants to patent a diet toothbrush.
Read more: https://www.vice.com/en/article/bmmem8/colgate-is-trying-to-patent-caffeinated-toothbrushes