Can my daughter get out of a "non-refundable" deposit with a dentist?

Question Details: My daughter (23) went to a dentist with severe tooth pain and was told she needed to have a root canal and a crown. They also required a signed "non-refundable" deposit of several hundred dollars even though the procedure is not until next Tuesday. After she told me how much the dentist was going to charge, I checked around and found that his fees were far above normal for this area. Can my daughter get her money back?

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