United Healthcare dental insurance with optional vision insurance is the best selling dental insurance policy in the United States. If you are self-employed or if your employer does not offer coverage, or you are between jobs, United dental can provide the coverage you are accustomed to. Cleanings, X-rays, and Exams are always covered instantly with all United Healthcare dental policies. Take a closer look to learn about other covered services, such as fillings, root canals, and crowns. And read below to learn about adding vision coverage to your dental policy.