How do I get Dental Insurance when I don't have a job?

My girlfriend was laid off from her job about months ago. She was only there for about 4 months. So she wasn't able to get health or dental while she was there because you had to work so long. (just crap job anyways) well now I want to get her some Dental Insurance because we need to get her teeth checked up. So where do I start on this? Is it really expensive? Do you make monthly payments or is it all up front. Thanks for all the answers Ben
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