 Well, after the assessment, if they have crevices on their back teeth or cavities, they'll get painted with the silver diamine fluoride. That's the clear liquid that kills the bacteria that cause cavities. So again, that kills the bacteria or rust the infection, because that's the underlying problem. Then we have the white nail gel-like material for the men in the audience. That's like an epoxy that's thick and viscous and it sets up hard.