The 5 Biggest Hair Myths...and One Unfortunate Truth

2. If you always use the same shampoo, eventually it will stop working.

You don't need to practice shampoo rotation to keep your hair clean. But if you've recently started coloring your hair or increased your use of hot tools, it might be a good idea to switch to a more moisturizing shampoo, says Mirmirani. Otherwise, stick with your favorite as long as you love it.