I've gone throught one bottle of BT and Im starting on my 2nd bottle in a week or so, but it took about 2weeks before I started seeing a difference in my new growth. It started getting thicker and by the 3rd week I started seeing a few waves. I haven't started my second bottle because I'm about 3-4 weeks post relaxer and Im trying to enjoy the freshness of my relaxer for a while and plus my sister has alot of graduation events and I wanted my hair to be fresh for that but after her graduation on the 21st, it back to BT!!!!!