It is hinted in Finding Emo that she and Jorgen are no longer a couple as Jorgen was shown dating a Fairy named Wallet.
Her gift for Timmy Turner's fairy-versary was a roll full of floss.
In "Shiny Teeth", she has to poof back and forth every time someone puts a tooth under their pillow, but in "Wishology!", she uses a machine called the Quarter Transporter. This was probably done so she doesn't waste so much time in poofing back and forth.
In "Fairy Idol", the Tooth Fairy is not a good singer, but a dolphin liked her voice.
According to her voice actress, Grey Griffin at Lee's LA Comic Con 2017, she explains that when she was young, she use to do prank calls with an attractive voice and that's how the Tooth Fairies voice came to the show.