New Wash is gentle enough to use every day. Most people use 2 to 3 times a week, but it really depends on your habits and preferences.
If you exercise every day and need to wash your hair daily, New Wash Original or New Wash Deep is probably your best formula option to clean effectively without any damage or overcleaning.
If you wash your hair once a week, New Wash Original or New Wash Rich is most likely the right formula to clean effectively and add moisture.
Know that New Wash is impossible to overuse. Over time you might need to cleanse less often as your scalp stops over-producing oils in response to the prolonged use of detergents, but this isn't the case for all our customers.