How long will they stay on for?

Generally, you can keep the hair system on approximately for four weeks at which point you will need to come into the salon for maintenance (this can also be done at home). Remember, everyone is different so a person with oily skin may require it changed earlier and someone with dry skin can go over the 4 week average. Also, lifestyles vary greatly so a person who swims a lot will require the system changed more often than someone who has a less demanding one.