Start ACTing to help prevent cavities, strengthen teeth and freshen breath. ACT Anticavity Zero Alcohol Fluoride Mouthwash is a once-daily mouth rinse formulated to help improve your oral hygiene routine. This ACT Mouthwash contains the maximum strength of fluoride available in rinse form without a prescription and helps prevent tooth decay. When it comes to happy smiles, trust the No. 1 dentist recommended fluoride brand*. *Among OTC mouth rinses.