Nick Jonas could use some floss.

During the 2020 Grammy Awards, Jonas, 27, caught the attention of viewers -- but not for his performance.

Eagle-eyed viewers spotted something stuck in Jonas' teeth while he sang "What a Man Gotta Do" with his brothers on stage.

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"NICK JONAS I KNOW UR FINE --S DONT HAVE A PIECE OF SPINACH IN YOUR TEETH AT THE GRAMMYS," said a fan on Twitter.

"Is Nick Jonas on the #GRAMMYs stage with a spinach or something in his teeth?!?" asked another.

Jonas took to Twitter as well to fill fans in on the situation.

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Nick Jonas, from left, Joe Jonas, and Kevin Jonas, of the Jonas Brothers, perform at the 62nd annual Grammy Awards on Sunday, Jan. 26, 2020, in Los Angeles. (Matt Sayles/Invision/AP)

"So honored to have been back on the Grammy stage tonight," the singer tweeted.

In a second tweet, he added: "And at least you all know I eat my greens."

Jonas and his brothers, Kevin and Joe -- as the Jonas Brothers -- performed their song "Five More Minutes" before "Gotta Do."

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The Jonas Brothers have been nominated for two Grammy Awards, including best pop duo/group performance for their song "Sucker."