Will my hair grow back?

I have like a nervous or ocd thing where I twirl my hair then straighten it out. I've noticed I pull like a strand or two of hair out sometimes. Over time I've noticed my left side of my head has gotten less thick with hair. I'm trying to stop. It's a real bad habit. I tend to do it when I'm thinking or having nothing to do. Will it grow back if I stop?

Will my hair grow back?
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