harmful bacteria lurk just below the gum line. crest gum detoxify works below the gum line to neutralize harmful plaque bacteria and help reverse early gum damage. and, now there's new crest gum and enamel repair... it gives you clinically proven healthier gums and helps repair and strengthen weakened enamel. gum detoxify and gum and enamel repair, from crest. gums are good, so is my check-up! crest. healthy, beautiful smiles for life.