In order to keep their licenses, dentists need to take 15 hours of coursework per year. Dr. Ronald Rouzer completes more than 50. He's kept up this personal goal in each of the nearly 30 years since graduating dental school. Given this, it's no wonder that he equips his office with so many up-to-date tools. Instead of a standard drill, he removes cavities with heat-free air abrasion. Instead of filling them with metal amalgams, he uses tooth-colored composite material. When performing gum treatments, he eliminates the need for sutures by using a laser instead of a scalpel.