Listerine smart rinse is a fluoride mouthwash that helps protect your childs teeth against cavities when used twice daily after brushing contains fluoride which strengthens teeth and reduces cavities by upto 40 more than brushing alone kills bad bacteria a major cause of plaque and gum disease goes arounds the whole mouth reaching teeth gums and tongue it attracts and tints the bits that brushing misses showing your child the proof is in the sink