It is legal. There is a thing called mouthwash to cleanse the tongue from the green slushy. There is also tooth brushes.
As for the other comment I was wondering if he had the V cut based on how the neck area looks. Seems pretty toned and V marks are awesome and I'll never get one lol
Extra Edit: I suppose I'll tone it down if someone is bothered by it. Im being humorous about the whole thing but I can see how it may be problematic later on with others using the stuff out of this thread. If I get banned I guess it was fun while it lasted. ¯_(ツ
_/¯