According to [Jafari Fiqh][1] the meat of boars is Haram (forbidden) but it is not Najis.
Products made of its hair like brush are allowed to be used. 

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ref:

By online Answering from [Official website of Grand Ayatollah Makarem Shirazi][2]. 


  [1]: http://en.wikipedia.org/wiki/Ja'fari_jurisprudence
  [2]: http://makarem.ir/websites/english/