A California man is accused of practicing dentistry without a license in an unsanitary office where he allegedly cooked meth. Joseph Hirsch, of Redwood City, is being held in San Mateo County jail on $500,000 bail after authorities received a tip about his alleged crimes, Mercy News reported.

Hirsch, 59, is accused of possessing and manufacturing controlled substances, possessing brass knuckles and possessing ammunition as a felon, the report said. Authorities said it was unclear if any patients had been harmed as a result of treatment allegedly provided by Hirsch.

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Authorities arrested Hirsch after serving a search warrant at Thermo Dental and a three-month investigation involving California’s Department of Dentistry and the state’s Department of Justice, Mercury News reported. The office is allegedly surrounded by warehouse businesses and auto-repair shops.

A news release revealed authorities discovered a “crude dentist office,” with an x-ray machine and dental tools, as well as narcotics and equipment used to manufacture narcotics. A man who answered the phone at Thermos Dentistry told Mercury News he had no comment on the arrest.