Now that you gave a same homework continously, I am thinking of another subject. It is so uncomfortable having much grey hair. = It's just so uncomfortable to have gray hair. Thereby I regularly have to dye my hair black by myself once a week.= Therefore, I regularly dye my hair dark once a week. One day when I had my hair cut, hairdresser told me dyeing is so harmful for scalp. = One  day, when I had my hair cut short, the hairdresser told me that dyeing is harmful for the scalp. So if you are going to have to dye openly , you change normal dyeing to henna that is natural. = So if you dye your hair by yourself, you have to use a natural coloring substance. But henna takes a long time to dye and is much more expensive. I decided to use both thing what I need.