How long does a cassia treatment last in comparison to a henna treatment? I ask because I have my hair in micro braids right now, and I need my hair color to stay the same when I get them redone in 3-4 months. I know that henna has the habit of enriching one's hair color, but what if it gives my hair reddish highlights?(my hair color is a very dark brown by the way) I'm afraid that the henna will change my hair color so much that then it won't match the correct color of braiding hair in the store.