No, Coca-Cola will not dissolve a tooth overnight. There is a small amount of edible acid present in many foods, including fruit juices and soft drinks such as Coca-Cola. But these foods are not acidic enough to harm your body tissues – in fact, your own natural stomach acid is more acidic. Any food or drink that contains sugars and starches can contribute to tooth decay, including sparkling beverages. Also, any food or drink that is acidic can play a role in enamel erosion. Through good dental hygiene and other health practices, you can help reduce the risk of tooth decay and erosion. The best way to protect teeth is to brush them twice a day with a fluoride toothpaste.