Celery is an effective weapon against the bacteria inside your mouth. In addition to the obvious health benefits of eating celery, it also causes you to chew more, producing additional saliva. As you generate saliva, it kills the bad bacteria present in the mouth. Celery may not taste as good, but is a healthy alternative to plaque-producing potato chips. The extra water contained in celery is a good way to clean your teeth, sort of like naturally brushing your teeth.