Many adults do without dental insurance until they have kids. There are a few reason for this but primary it because as an adult you may have proper dental care habits with good teeth and feel you can pay cash for your twice a year dental visit. Things can be different once you have a child. Child dental care can become expensive quickly so having insurance is a good way to reducing the cost for their dental care needs.
However when buying dental insurance for a young child under age six you will want to make sure that either the plan you are buying lets you go to any dentist you want or that there are dentist within the plans network that is able to provide services to young children. Not all dental office are kid friendly.