Ingesting carbs constantly throughout the day also leaves people more prone to cavities. “If you snack all day long, the bacteria wake up and start producing acid every time you ingest any type of a carbohydrate,” Harms says. During a typical meal, your saliva levels are higher, working to protect your teeth and aid in digestion. But as you graze throughout the day (or even slowly sip a cup of coffee), those repeated “exposures” to food give bacteria a meal every time, leading to more acid on your gleaming teeth.
The most important thing to remember: It doesn’t matter exactlywhen you brush your teeth, so long as you head into the night without bacteria (and the food they feed on) in your mouth. Just be sure to brush again in the a.m. and floss to get the bacteria out from between your teeth. And try to cut back on constant snacking—and maybe that second cup of coffee—to avoid feeding the mouth monsters within.