Tooth decay is one of the most common of childhood diseases and there are many steps which can be taken to prevent this. There is far more to having healthy teeth than daily brushing. It is important that your child has an adequate fluoride supply too as fluoride which is a derivative of fluorine, a common element in the Earthâ€™s crust, prevents cavities. Fluoride also plays a significant role in tooth development and it can even reverse the signs of early tooth decay. It is common during routine dental checks for your dentist to speak with you about your water supply to determine whether or not it is fluoridated.