US Patent No. 8,642,017 B2; Orabrush, Inc., Provo, UT, has patented a method of applying a liquid cleaner to clean the surface of the tongue. It entails obtaining an oral cleaner comprising water, poloxamer 407 as a foaming agent, a sweetener, a flavoring agent, an antimicrobial agent, a preservative and a coloring agent. The oral cleaner is in liquid form prior to being dispensed from a container. It converts to a foam while being dispensed, and returns to a liquid when placed on the tongue. T...