America is making progress but could do more to ensure good oral health for children, according to this report card from Oral Health America. Dental sealants, for example, are one of the most cost-effective ways to protect against tooth decay, but only 23 percent of U.S. 8-year-olds have them. The report also calls for better state guidelines on "competitive foods" -- low-nutrition, high-sugar foods -- available in schools.