Hair doesn’t actually “get used to” anything, says New York City hairstylist Danielle Irene. If your hair doesn’t look as good as it did when you first started using your shampoo, it’s because of one of two reasons: Either your shampoo has too many surfactants (foaming agents that dry out your hair), or it has ingredients that coat your hair. If you often deal with flyaways, your shampoo is likely over-drying your hair; if your hair is flat, then it’s coated, says Savone.

The solution is not to switch off between shampoos. It’s to switch completely. Savone says a good shampoo should do neither of these things to your hair, no matter how many times you use it. Look for sulfate-free products to minimize dryness and steer clear of silicone, which can coat your hair. Or if you really can’t give up your current products, Irene suggests using a clarifying shampoo every few washes to get rid of any product build up.