She’s not only getting killed off her TV series, embattled NICOLLETTE SHERIDAN’s been dumped by her dentist – who snapped that he can clean teeth, but not her filthy potty-mouth!

Insiders say patients constantly complained that whenever the “Desperate Housewives” diva showed up for chopper checks, she cursed worse than a porn star.

After years of warning her to zip it, the dentist finally showed his teeth and snarled: Find a new mouth mechanic, lady!

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