It's family health insurance plans that are expensive of course, but dental insurance is not near as much money. It's still a nice chunk of change, but it's the work that you get done that is what costs so much. In other words, if you just purchase your policy and never have to go to the dentist, the insurance itself isn't too bad.
But when you have kids, you're taking them to the family dentist quite often, right? You yourself want to go as well, so that means you're going to need the best dental insurance company and plan with a lower deductible.