First, for people who can’t brush their teeth after each meal, washing their mouths with water after a meal will prevent a significant amount of bacterial growth. Most people brush their teeth after breakfast and dinner, but most people are stuck at work during lunch and do not bring a toothbrush to work. This means that lunchtime bacteria have time to grow and accumulate by feasting on the food that is left over in the mouth after lunch. Try to rinse the mouth out with water after each meal to remove some of these extra food crumbs and prevent bacterial growth that can cause oral disease.