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.
Delta Dental PPO, our preferred provider organization plan, gives you the freedom to visit any licensed dentist, anywhere in the world. To provide the lowest out-of-pocket cost, you are encouraged to seek. care from a PPO network dentist. The PPO network is one of the largest in California and in. the nation.