Colgate-Palmolive has recently filed a patent application for a toothbrush with the ability to deliver a dose of chemicals to the user. It could be used to dispense painkillers, diet pills or invoke sensations such as cold or heat. But the idea has taken it's course particularly towards caffeine. Although this easy to use caffeine toothbrush might sound appealing to many coffee drinkers who don't have the time to make a cup in the morning, or may be need the energy but don't necessarily like the taste, the FDA is skeptical and is investigating the safety of the caffeine dispensing brush, focusing on adolescents and children. I guess we'll find out the future of this interesting device soon.