There are millions of harmful plaque bacteria that can lurk around the gum line and cause gingivitis. Crest Gum Detoxify Gentle Whitening Toothpaste has an activated foam formula that penetrates hard to reach places to neutralize harmful plaque bacteria even around the gum line, for clinically proven healthier gums. It is also formulated to cool gums during and after brushing for a refreshing clean. Because if you're not taking care of your gums, you're not really taking care of your mouth.