Yes, according to the Huffington Post, Colgate-Palmolive has filed a patent application for an oral care device that could administer chemicals when it comes into contact with a person’s mouth or teeth.
Among the substances listed as those that could potentially be delivered through the toothbrush is – you guessed it – caffeine, which is listed in the patent as a “homeopathic teething or inflammation soothing additive.”
Other substances which could be administered by the toothbrush include various flavors, capsaicin (a substance found in chili peppers that could be used to create a warming sensation), appetite suppressants, or painkillers like benzocaine (which could be for teething children), Gawker reporter Maggie Lange explained.
Each of the device’s chemical-releasing patches would last approximately three months, according to the Daily Mail, and the different types of brushes would be differentiated by different shaped tongue cleaners. In other words, an apple-shaped one would be apple flavored, a snowflake would release a substance that would provide a cooling sensation, and a candle or flamethrower would indicate that the brush would release a warming substance.