An oral sanitation system may include a case including: a support portion defining a lower end of the case; and a container portion extending from the support portion. The container portion may define a wall extending from the support portion to a top end of the container portion. The oral sanitation system may further include a closure including a lid formed with a peripherally-extending wall; a lower cavity defined by the wall of the container portion; an upper cavity defined by the peripherally-extending wall of the closure; and a light-guiding floor that is substantially transparent to UVC light, the light-guiding floor forming a bottom of the container portion that is surrounded by the wall.