Misc: CPC antigingivitis/antiplaque oral mouthwash. Alcohol free. 99% germ kill and healthier mouth (Gingivitis reduction vs. brushing with ordinary toothpaste.). Reduces plaque bacteria. Helps prevent gingivitis. Freshens breath. www.crest.com. In some cases, antimicrobial rinses may cause surface staining to teeth. This is not permanent or harmful, and may be prevented by adequate brushing or removed at your next dental visit.