Most tooth decay can be warded off by regular brushing. Removing the plaque that builds up every day makes it less possible for bacteria to flourish. Here are some other factors that can promote tooth decay:nnFoods that stick to your teethnFrequent snacking and drinkingnDry mouthnEating disorders, such as anorexia and bulimianMethamphetamine usenWorn or damaged fillingsnLack of fluoridenDiabetesnUse of tobacco products