PLANO (CBSDFW.COM) – A Plano man was arrested on Thursday for running an unlicensed dental practice in several makeshift offices inside his home.

Police told KRLD that the man, 63-year-old Jose Santiago Delao, advertised through word of mouth and targeted those who did not have dental insurance. Investigators were initially tipped off to Delao’s illegal business by a patient who felt he had improper work done on his teeth.

“The Texas State Board of Dental Examiners actually sent a couple of investigators down to assists us,” said David Tilley with Plano Police. “And we were able to determine that basically, he’s operating a full blown dentist office out of his personal residence.”

Investigators say that Delao often performed complicated surgeries, though it’s unclear if he had previous dental experience in any country. Delao was taken to jail on Thursday and charged with a third degree felony for not having a license to practice dentistry.

“After talking to the Board of Dental Examiners, they’re indicating to us that this is becoming a problem,” said Tilley. “I don’t know whether it’s just the insurance situation, or what the purpose is, but they’re saying it’s actually starting to become more of a problem that they are seeing.”

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