Delta Dental insurance is a network of companies that provides dental insurance to almost 70 million people in the U.S.A. There are a total of 39 companies in the network spread throughout the country. The cover usually includes regular checkups, x-rays, cleanings and several other services. One may also opt for a cover that includes oral surgery, orthodontia, or dental implants. You can get a free online quote or call your broker for one.