Most Helpful Guy
Often the problem is with the hair care products you use.
Start by using products (shampoo and conditioners) with out SLS, it is a strong detergent in a lot of shampoos if can causing your hair to dry out because it strips the hair of natural oils therefore you hair could look dull. . I like the products from Sensible Addictions they have salon quality products and great fragrances (for women and men). If you have thin hair I would try their Hemp Shampoo otherwise the Aloe is great. Also I would consider using a leave in conditioner to start then switch to a regular conditioner. You can find Sensible Addictions on the web sensibleaddictions. Try their stuff I think you will like them.
Most Helpful Girl
Make sure your hair stays hydrated. A lot of conditioners only coat your hair with wax to give the impression that it's shiny and healthy, but if you want it to actually be healthy, do a deep condition (with a high-quality conditioner or treatment) 2 or 3 times a week. If you blow dry, flatiron, or curl your hair, make sure you use heat-triggered product to help protect your hair from heat damage, as well as make your hair look radiant. Honestly, the biggest problem most hair has is that it doesn't get enough moisture to keep it healthy (having oily hair doesn't mean it's not dehydrated). Next time you go in to your hairdresser for an appointment, ask her/him for some advice. They can recommend specific products and techniques that will help your hair.