The GI, or digestive, tract extends from mouth to anus (see the image below). The division of the GI tract into upper and lower is a matter of some confusion and debate.
Dental PPO insurance plans, also known as dental preferred provider organizations or DPPOs, are a popular dental insurance option due to their flexibility in allowing insured members to choose dentists and dental specialists.
Similar to PPO plans, a network of dental providers is under contract with the dental insurance company to provide select services at predetermined prices. Low cost dental insurance for seniors such as HMO plans are most popular with businesses who use them to insure their employees at affordable rates.