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Using undercover surveillance, KNXV reporters exposed Mexican dentists who crossed the border to perform illegal weekend procedures on illegal immigrants. The cash-only operation, which usually took place in the back of homes and in abandoned trailers, operated under the state dental board's radar. In some instances, patients risk serious infection at the hands of unlicensed dentists. As a result of the investigation, two of the dentist practices were shut down and KNXV was able to open up phone lines to "help people who needed dental care from licensed clinics."