The products at 天然護髮用品中心 are quite professional. The staff there can provide you with professional advice. Yesterday, I went to the one in Mong Kok (on Argyle St.) and had my hair cut and hair treatment (a hairstylist called MO served me). The outcome was much greater than my expectation!!! Go and have a try! The hairstylist who served me is a pretty famous and popular one. Make sure you call in advance and make a booking if you want to be served by her!
http://www.naturalhair.com.hk