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.
PPO stands for Preferred Provider Organization. A PPO is a kind of health insurance or managed care plan. Networks: Like HMOs, PPOs have a network of doctors and other providers. However, you can choose to see providers who are not in the network. You usually pay a higher cost to see providers who are not in the network.