As long as you use 100% pure henna powder, then yes you can use chemical dyes/treatments as you normally do. You won't have to wait months to do your chemical treatments/dyes as the hair dresser would like to tell you. Keep in mind, that the hair industry is run by major companies that push all types of chemical products. They are in no way trained, or specializing in henna, and natural hair care (for the most part). You should give your hair a break in between treatments. Roughly about 1-2 weeks.
Sent from my iPhone using Tapatalk