I always change shampoo's often because I've heard using the same shampoo continuously is not good for the hair . I've used so many shampoo's/conditioners but none damaged my hair like avon's advanced techniques has. It has made my hair dry and lifeless and so tangly that brushing is actually painful. Not to mention how much hair it has caused me to lose! I've never lost so much hair in my life like what I've lost during the few times I've used this product. Granted my hair is curly and tends to frizz but no other shampoo caused it to frizz out of control like this shampoo has and it left my scalp feeling tight and itchy! I'm shocked at how damaging this avon product is! I'm trying to get my hair back to how it was and I'm sure its going to take a lot of time considering the damage! Never again will I use avon shampoo's/conditioner!