Dental erosion is caused by repeatedly exposing teeth to acid over time. You may notice changes in the appearance of your teeth and pain or sensitivity with your teeth. Common sources of acid include acidic foods or drinks, acid reflux, and vomiting. Use of a straw for beverages, rinsing your mouth with water or milk after vomiting and try to wait 1 hour before brushing after any of these circumstances. Also chewing sugar-free gum will help increase salivary flow to remove acids. And of course, brushing your teeth with a soft-bristle brush and a fluoride toothpaste.