Cavities are caused by the enamel of your child’s tooth breaking down over time – this is caused by plaque “holding onto” acids from sugary foods and then making these little holes in the tooth. Cavities are very common and are not a cause for alarm, especially if they are caught early. However, if left for too long, cavities can cause tooth decay. That is why we place such importance on healthy oral habits! Brushing twice daily and flossing are the best means of preventing cavities to occur.