I had done loreal xtenso hair smoothening done first time, it came out well and after a year I repeated same session in different salon, and as the stylist applied the chemicals to my scalp and he burnt my scalp and I lost most of the hair from scalp. However I gained hair back after a year, as the follicles were not damaged, but my hair looks rough and although hair from scalp has grown back, it is not as thick as it was earlier, also hair from other parts of my head has fallen, and I feel hair has become very thin after all these treatment. Now I stopped using any chemicals to my hair, and started using sulphate free shampoos and now am using henna to my hair instead of colouring. Can I use henna for hair growth? Is it good or bad? And please give me any suggestions to grow back thick hair as it was earlier. My age is 32 years, am a software consultant.