Below is an excerpt from an article found on Colgate.com that was written by Jennifer Mitchell Tooth enamel isn't just strong; it's the hardest substance in your body. It isn't indestructible, however, and can be eroded by substances that are stronger. Acid exposure can come from many sources, but with the help of your dentist, you can keep your enamel strong and healthy. Symptoms Acid erosion on teeth can lead to a variety of symptoms that should be evaluated by a dentist. As the outer layer of your teeth wears away, you may experience tooth sensitivity . This sensitivity often leads to pain when you consume hot or cold foods and drinks. Your teeth may also become discolored. This is because the enamel is white, unlike the sensitive, yellow tissue underneath is known as dentin. As the enamel erodes and exposes more of your dentin, your teeth begin to show more of its yellow color. The appearance of your teeth can change in other ways as a result of acid erosion, ...