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.
The advantage of PPOs over indemnity plans is that dentists within the PPO network typically agree to accept lower fees for procedures, according to Ireland. So, a crown that results in $500 in patient costs under an indemnity plan might mean $400 in out-of-pocket costs under a PPO plan.