I had a good first experience with a rinse, so as long as it keeps working that way, I'm happy!

Oh yeah, I can tell you from experience. I hennaed a year and 6 months ago and my wave pattern has been weaker with less spirals. However, it could also be that I began growing out my hair 2 months before that and long hair weighs everything down! D:
-2b waist-length hair (ringlets in the front and canopy, straighter under-layer)
-Dense head of med-coarse strands
-Low porosity