ouch.
you should be able to keep her the medicaid or CHIPS. chips has co-pays but it beats the heck out of nothin'. you might check into putting your son on one or the other too. it would all help if you don't mind the little bit of paperwork.
the medicaid and chips will also send a paper stating there was medical coverage for your kids so later on any new insurance can't get you for a pre-existing condition. they recommend that you keep that paper as proof of coverage when applying for new insurance.
hope the dental thing went well.