With the Caruso Molecular Steam Hairsetting System, the molecular hold is so strong, it can only be released by shampooing! Because there is no damaging heat, you can use the Caruso system as often as you like. The molecular steam hairsetting system actually curls hair from the inside out. Since Caruso uses only water (no salt) to curl your hair, there is no risk of damaging the hair like traditional hairsetters. The gentle steam actually adds moisture and conditions hair as it curls.