OPI Repair Mode Nail Serum is a fast-acting serum that penetrates the nail to build new bonds from within, repairing nail keratin by 99% when used as directed. It uses patented Ulti-Plex Technology to penetrate from within the nail and recreate protein bonds. After a couple of days of use, nails may seem stronger, and after a week, they may feel less brittle. MSRP $29 Thank you for checking out my closet @msbootyboutique 😘 This counts as 1 item in my 💙3/$30💙 deal. Which is for my entire closet. When you bundle you save $ big time!!!