Question about salon and relaxing

I was thinking about this, since I just went to the salon this weekend and got a touch up. I usually only go when Im due for a touch up. In the past my mom would apply it and she would use the back of the comb, when I go to the salon and the owner applies it, she usually uses her hands, and I have no problems. But everyone else uses the paint brush thing and sometimes it burns. I was just wondering, do you think the bristles on the brush could actually be lightly scratching it the scalp, causing it to burn??
 
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