want to consider getting this product.. any suggestions? I have thick hair semi-long [about my shoulders] and very curly and frizzy, thinking of getting two bottles of the heaviest one. [I am 14]

I am trying to convince my mom that things like this work so please either message me or post here with info and reasurring comments! thanks so much!! :]
CG since 5/07 2C/3A currently using: jessicurl, Tigi Catwalk, re:coil and many more... proud to be a PJ!