Court records allege the offence happened when the victim visited Ahmed's practice, Universal Smiles, to have a tooth removed.
The man was told by Bilal that nitrous oxide was needed to sedate him, it is claimed, and an assistant was there when it was administered.
But when the man awoke the assistant was gone, his mask was askew and the dentist was forcing him to perform oral sex, the documents allege.
He was then escorted back to the recovery room by the dentist, the papers say, and he left Ahmed's office two hours later.
US Dentist Bilal Ahmed put penis in anaesthetised patient's mouth | Latest News | Breaking UK News & World News Headlines | Daily Star