Below is an interesting inforgraphic that talks about ten tips to prevent tooth decay. This includes visiting your dentist regularly, brushing twice a day, brushing your tongue, using fluoride toothpaste, using mouthwash, flossing daily, considering dental sealants, limit snacking, drinking some tap water, and eating tooth-healthy foods.
This infographic is from Sydenortho see http://www.sydenortho.com/