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.
1 Members pay the dentist up front then get reimbursed for eligible services.  Employers can offer two plan options with separate rates: a dental indemnity plan and a Dental Maintenance Organization (DMOÂ®)* plan. DMO is available at about half the cost of a traditional dental PPO plan.