Preventive dentistry is the proactive steps and actions of caring for teeth and oral hygiene to keep healthy. There are a wide variety of topics, and activities that fall under this category from brushing your teeth daily, to mouthguards and doctor visits. The easiest and most important part of all oral hygiene begins with brushing your teeth. To make sure your teeth are getting proper care when brushing look for toothpaste with the ADA Seal of Acceptance, toothpaste with this seal must contain fluoride to strengthen teeth and ingredients to remove food residue.