If you're massaging your scalp thoroughly (and not the length of your hair), then you won't be doing much - if any - damage at all. It might also be helping your scalp's health by increasing blood flow, which naturally leads to healthier growth.

Hair is best when wabi-sabi.
2b/2c at this length, more 3a when shorter
M/C ii

Mod CG: Sept 08
Using: Suave co-wash, GVP Conditioning Balm, Lustrasilk OOC, MGA, BRHG
Humectants: @ dew point 40+
My blog for dry climate curlies and growing out a pixie: Colorado Curly