Mouthwash is a chemical napalm strike on your mouth. It kills bacteria on contact — including the good bacteria that naturally keep your breath fresh. Within 30 minutes, the bad bacteria grow back even faster because there's nothing left to compete with them. Rest Viva works the opposite way: it introduces beneficial probiotic strains that colonize your mouth and crowd out the odor-causing bacteria over time. Instead of a 30-minute mask, you get lasting balance.