Filings are one of the fastest, simplest, and most affordable ways to treat cavities for kids. Cavities are a big deal, even if they're only present in the baby teeth. Cavities can cause pain and discomfort, and may lead to infected teeth or even tooth loss. The baby teeth are just as important as your child’s adult teeth, since they help form the paths that adult teeth follow when they emerge later in life. With a dental filling, your child’s tooth will stay healthy for years to come.