Signature Fern Gel™ Gentle 11% HP Active- Whitening Tray Refill Gel (Regular Strength)Signature Fern Gel Restore 11% Hydrogen Peroxide Whitening Gel Canadian made Professional Take Home Whitening Gel Refill for Dental Clinics Product Code: #140 003 #140 012 #140 048Unit Type: Tube Units (1 tube = 3 3ml syringes + paper shade guides)Technician Use: Retail Key Benefits: 11% Active Hydrogen Peroxide Whitening GelDual hydrogen peroxide and carbamide peroxide system calibrated to deliver a true 11% active whitening strength once peroxide