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.
What is a PPO? PPO, which stands for Preferred Provider Organization, is defined as a type of managed care health insurance plan that provides maximum benefits if you visit an in-network physician or provider, but still provides some coverage for out-of-network providers.