Boar bristle brushes??

I don't eat, wear, or use anything that comes from dead animals or animals that are treated badly. Are boar bristle brushes bad to use? I mean, do they just cut off their bristles to use or do they treat them inhumanely or kill them?
Update: If you are a bitter, unhappy person with nothing better to do than sit on Yahoo Answers and act like a jack ***, please do not respond.
Update 2: I'm not vegan. Just vegetarian.
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