DALLAS -- A Dallas dentist's office is closed and the man known as the "singing dentist" is behind bars, arrested in an undercover sex sting over the weekend.

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Dallas Man Arrested In Sex Sting

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The FBI arrested Phillip Todd Calvin, 43, of Dallas. Calvin, who has two children of his own, has a thriving dental practice in the Dallas suburb of Lakewood and now faces serious charges of traveling across state lines to have sex with a minor.

Calvin is known to many in Dallas as the "singing dentist" because of his musical past as well as his penchant for singing while at work.

An undercover FBI agent said he met with Calvin and several other men at a convention for the North American Man/Boy Love Association, or NAMBLA. The FBI said he spoke to them about their lifestyle, including trips they'd taken to Acapulco and Southeast Asia to have relations with boys.

The agent then volunteered to make arrangements for a trip to Mexico, and that is what the led to the arrest of the men.

Also arrested on a boat dock on Harbor Island in San Diego, Calif., were David Corey Mayer, 49, of Chicago and Paul Ernest Zipszer, 38, of Deland, Fla.

"This investigation was part of an undercover operation for the past year in which a San Diego FBI agent became a trusted member of an organization known as NAMBLA," said Daniel R. Dzwilewski, the special agent in charge of the San Diego Division of the FBI.

On Saturday, the FBI executed a search warrant and searched the Lakewood home that Calvin shared with his wife and two children.

Calvin remains in a San Diego jail.