The worst thing that you can get is tooth pain. These are caused from untreated cavities and can give you a lot of trouble. If the reason, not to get your treatment for cavities, is the high costs you should know about full coverage dental insurance. This kind of insurance is not going to cover only the costs for treating the cavity but it will cover a lot of others procedures like root canal treatments, cleanings and check-ups and even the surgeries in case of needing.