 It's time for a Crest Pro Health reality checkup. That grime is the buildup of plaque bacteria that can cause cavities in just months. You need to switch to Crest Pro Health. While most toothpastes stop working in minutes, Crest Pro Health's antibacterial fluoride protects for up to 12 hours to stop cavities before they start. So pick some up on the way home. Smile. Crest has you covered.