Hill, 45, who first displayed the clear straighteners at the Country Music Awards in November, attracted a lot of attention to them at the Grammys, UsMagazine.com said.
"I had braces as a kid. I forgot to wear my retainer," the singer recently told radio station KNIX.
No word on how long Hill will have to wear the braces.
Notable deaths of 2014 [PHOTOS]
Jason Aldean to extend Burn It Down Tour