Stock image of a nail tech holding up color swatches on artificial nail tips. A nail tech took to TikTok to share the secrets your salon doesn't want you to know.

A certified nail tech has revealed 18 little-known secrets about salons - from sneaky tactics they use to keep customers coming back to a common practice that's actually illegal.

Starting today through Dec. 18, a complimentary bottle of the “Eternal Optimist” Essie x “Hoda & Jenna” nail polish will be given with every purchase of its mug companion.

Editor’s Note: While the Essie Nail Polish gift is now sold out, you can still purchase the official TODAY with Hoda & Jenna mug at NBCStore.com and the “Eternal Optimist” Essie nail polish ...