Matrix Instacure Build-A-Bond Instant Revival Liquid Mask, Billion Bond Care to repair mega damaged hair! Infused with Citric Acid u0026 Squalane. Like a serum, its liquid creamy texture builds bonds inside your damaged hair* and works intensely on the hair fiber surface for strength and smoothness, conditioning and shine. 1 billion bonds in every bottle to fight damage u0026 reinstate hair slay. With continued useTo use: Apply on damp hair, from the mid-lengths to the ends. Leave-on for five minutes then rinse out.