What’s the first thing that your client does when shopping for a new shampoo? She takes a whiff, of course! Pourquois? According to Alan Hirsch, M.D., founder and director of neurology at the Smell & Taste Treatment and Research Foundation in Chicago, “If a product smells good, people perceive it to be good. Smell affects our emotions faster than any other sensory modality.” The beauty industry more than “nose” about this scent-sory pro, and have infused shampoo and conditioner duos with everything from fresh mint to floral fragrances. You may not be able to smell the twosomes on the following pages, but trust us—they smell divine!