"You're Probably Using Too Much Toothpaste"
"Toothpaste ads usually show a gorgeous dollop of toothpaste that runs along the entire length of the brush, but the truth is that you only need a pea-sized amount to get your teeth clean. The ads feature larger amounts for the sake of aesthetics and to encourage you to use up more product."
https://www.amazon.com/Panef-Corp-Powdered-Graphite-Lubricant/dp/B0016GZQ60
Now I don't use hairpins but I would think the side WITHOUT the sharp pointed end would be better against your scalp?