2. My child has cavities because he has soft teeth.
There is no such thing as having “soft teeth.” In fact, enamel (the outer surface of the tooth) is the hardest substance in the body. There are many factors that cause dental decay so it is often difficult to pinpoint the exact cause. We do know that there are three things required to cause tooth decay: bacteria, a diet for the bacteria (sugar!), and a susceptible host (the tooth).