dreadhead approved [SEP] i have dread locs about as thick as #2 pencil or slimmer and i recently tried dting my hair with another brand, little to no change. i used this about 3 weaks later, HELLO! its not a shocker or anything but I got the desired effect. fyi i have a lot of hair, thick and shoulder length, i used 4 boxes and sat for about 45 min after the 40+ min that was applying it to all this sheep's butt of hair lol