Supplemental dental insurance is an individual or family insurance policy purchased to cover a portion of the dental costs generally up and above or beyond the primary dental plan. Supplemental dental insurance will normally not cover the entire dental care procedure. But instead is synchronized or works hand-in-hand with your basic dental policy.
If you have a primary dental insurance plan that you purchased or your employer provided, the supplemental dental policy typically covers the remaining dental bill.
For example, if the dental plan policy covers half of the dental cost, the secondary or supplement dental insurance plan should cover the remaining balance of your dental procedure subject to any co-payments or deductibles already included in the policy.