DrTung s - Snap-On Toothbrush Protection + 4 Anti-Bacterial Refill Discs - 2 Piece(s) DrTung s Snap-On Toothbrush Protection gives 8 months total protection per pack. Toothbrushes harbor a host of harmful bacteria that can re-infect your mouth when you brush. This is a revolutionary product that releases all-natural anti-bacterial vapors to kill germs and safely sanitize your toothbrush between brushings. DrTung s Snap-On is earth-friendly.