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.
Typical Coverage. Those costs apply to the most common type of dental insurance, which is referred to as 100-80-50 Dental PPO style plan -- this means that the plan covers up to 100 percent of fees for cleanings and normal preventive care.