Here’s why it works: Using too much conditioner makes your hair appear greasy and limp, says David. It can also leave greasy residue that leads to oil build-up. So only apply a small amount on your ends, which are more prone to dryness. Can’t give up your conditioner? Then apply your conditioner before your shampoo, says hairstylist Ben Thigpen. This way you’ll get the moisturizing benefits, but the shampoo will remove any extra residue.