Colgate Zero Mouthwash Healthy Gums helps prevent plaque and gingivitis and has a delicious natural spearmint flavor. Colgate Zero Mouthwash formula is gluten- free, vegan and has 0% alcohol, dyes, artificial flavors and artificial sweeteners. Every ingredient in Colgate Zero Mouthwash formula serves a clear purpose. Find out more on colgate.com. Colgate Zero Mouthwash - a clear choice for a clean mouth.