if she asks what it is you're putting in your hair, and the only way she'll notice is the smell, which fades, tell you to not ask so many questions, and change the subject.
aka, STFU b**ch :lol:
If you were using liquid, there's no way in hell she WOULDN'T notice the 4 hour oil slick or the giant white crumbs of dried liquid.
Other than the fragrance, nobody can tell you're using foam.
That said, My last girlfriend, I just flat out told her I was using the stuff.
Man, girls get lipo, boobjobs, freaking BOTOX, they've got remedies up the *** for everything.
There's nothing to be ashamed of here, provided you give her some time to get to know you before you start unloading all your little problems onto her.