Literally, you brush your teeth with this stuff and -- within seconds, minutes? -- you're fast asleep. At least that's the claim of its inventor -- a certified (not certifable) dentist who apparently (OK, we're speculating here) wanted something to put out his whining patients before they even got the gas. It is serious, though; and for those who feel like combining their pre-sleep brushing ritual with something other than Ambien-CR, it might be worth a look.