The 6 Factors That Increase the Risk of Tooth Decay Tooth decay can be a difficult, uncomfortable and expensive problem to deal with; so in order to prevent it from happening, you should do your best to minimize the risk factors that can cause it. Here are 6 of the most common factors that increase the risk of tooth decay: Poor oral hygiene, Hidden sugars in foods and drinks, Frequent snacking, A diet filled with sugary foods, Decay-causing mouth bacteria, Reduced saliva. 1) Poor Oral Hygiene Poor oral hygiene is one of the main risk factors for tooth decay. When you don't brush and floss your teeth regularly, plaque and bacteria can build up on your teeth, which can lead to cavities. Plus, if you have gum disease, it can also make your teeth more susceptible to decay. 2) Hidden Sugars in Foods and Drinks Hidden Sugars in Foods and Drinks : Many people are surprised to learn that hidden sugars in foods and drinks can also contribute to tooth decay. One of the biggest factors that...