Advance to Healthier Gums and Stronger Teeth* with Crest Pro-Health Advanced. This toothpaste contains ActivClean Crystals for advanced stain prevention. Like all Crest Pro-Health toothpastes, Crest Pro-Health Advanced Active Strengthening Toothpaste strengthens teeth enamel against cavities on the inside and protects outside of teeth against acids in everyday foods**., * Fights plaque and gingivitis. Strengthens enamel. , ** Acid erosion effects: Acids in everyday foods can soften and thin enamel, leaving teeth less white, weaker, and sensitivity.