There are a lot of choices today for cavity fillings. Decay is the primary disease of children in America today. A lot of children do suffer from extensive dental disease. We have all sorts of filling materials. We have white filling materials. One of them is a composite or a resin. That is a material that is bonded into the tooth and actually makes the tooth stronger. The benefits of a composite are that the tooth looks white when it's done, so it looks like a natural tooth. It also strengthens it from the inside. That is the primary material we use today in children. There is also glass ionomer, which is also a white filling material. The difference with that one is that one contains some fluoride in it. It is for children who are highly susceptible to recurrent decay, where they have had multiple fillings and multiple attacks of decay in their mouth. This is a white material that strengthens the tooth the same way that bonding does, but also adds a little bit of fluoride to give them additional protection. There is the traditional silver fillings, that were mostly used in the past. They are still used today. They are a mixture of copper, zinc, and mercury. You place it into the tooth. It's a strong material. It's long lasting, but it does have mercury vapor that leaks out of the filling in very minute amounts throughout the lifespan of the filling. Sometimes we make other choices that do not have any byproducts. The white do not have any byproducts, the silver one does.