The New York Times had a solid story on the problems associated with dental inequality.
Not being able to see a dentist is related to a range of health problems. Periodontal disease (gum infection) is associated with an increased risk of cancer and cardiovascular diseases. In part, this reflects how people with oral health problems tend to be less healthy in other ways; diabetes and smoking, for instance, increase the chances of cardiovascular problems and endanger mouth health.
Although states offers dental care for children, when it comes to adults it is a different story.
As of January 2018, only 17 state Medicaid programs offered comprehensive adult dental benefits, and only 14 of those did so for the population eligible for Medicaid under the Affordable Care Act. More typically, states offer only limited dental benefits or none.
As the article points out, we have a long way to go in America to get everyone the quality dental care they deserve.