It seems that Hiram Monserrates teeth are as rotten as his reputation.

The prison-bound ex-pol has won an extra month of freedom for desperately needed dental work on his diseased choppers, court papers reveal.

Monserrate who was sentenced to two years in the slammer for corruption went to his dentist in mid-January complaining of recent, severe pain, defense lawyer James Neuman wrote.

Tooth doc Louis Shapiro performed repeated root canal procedures, but Monserrate still needs four more crowns installed, according to the Manhattan federal court filing.

Dr. Shapiro opines that this treatment is necessary and must be done expeditiously in order to avoid additional damage, Neuman said.

Upon information and belief, it is very unlikely that this type of work would occur while Mr. Monserrate is in custody.

Judge Colleen McMahon gave Monserrate until April 11 to start serving his time behind bars.

The disgraced Democratic lawmaker from Queens pleaded guilty last year to scamming nearly $100,000 in slush funds while serving on the city council in 2006.

He was booted from the state Senate in 2009 after getting convicted of roughing up his girlfriend, Karla Giraldo, for which he was sentenced to probation.

bruce.golding@nypost.com

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Disgraced pol Monserrate gets month of freedom to fix diseased teeth