The frequency that you wash your hair depends on your hair type and lifestyle. Oily hair may need washing daily or every other day, whereas dry or curly hair thrives with 2-3 washes per week to retain natural moisture. Coloured hair should be washed 2-3 times weekly to keep colour vibrant, while washing fine hair every other day helps to maintain volume. If you have an active lifestyle, shampooing as needed post-workout is best.