It is not uncommon to have a balance even if you have dental insurance coverage. Here are some reasons to consider:
Your insurance company may not fully pay what was estimated
You may still owe a co-pay or a deductible
Your insurance company may have denied a portion of or all of your treatment
Your insurance benefits may be maxed out
You may have a waiting period that has not been met
Your treatment may have been downgraded by your insurance company