A hapless Mets fan tried to make a diving catch when her gold tooth fell into a Citi Field toilet — and got her arm stuck in the commode.

The unidentified woman's bizarre Flushing adventure happened during last Wednesday's game against the Atlanta Braves, sources said yesterday.

It's unclear how long she was trapped screaming in the john, but stadium security guards and emergency medical personnel eventually showed up.

But they could not pry her loose on their own.

They called for back-up — dialing up a worker from Cardoza Plumbing, the company that installed all 646 ultra-low-flow toilets at Citi Field.

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