A mouth-guard to be worn by a user includes a main body including a channel, one or more gum protrusions, and a slot; and an insert configured to be inserted into the slot. The insert for the mouth-guard includes one or more liquid chambers and one or more initial orifices on the surface of the insert where each initial orifice is configured to transport liquid from the one or more liquid chambers to an orifice of the main body such that the liquid passes through the orifice of the main body into a user's mouth.