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HUMAN BODY-TEETH


THE  20   PRIMARY  TEETH  (ALSO  CALLED  MILK TEETH)Usually   begin  to  erupt   when  a  baby  is  about  six  months   old .They  started   to  be  replaced   by   the  permanent  teeth  .When   the  child  is  about   six  year  old   .By  the  age  of  20  .most  adults   have  a  full   set  of  52  teeth   although   third  molar  (commonly  called   wisdom  teeth )  may   never  erupt .
Teeth  help  people  to  speak   clearly  and  give  shape  to  the  face ,their  main  function   is   the  chewing  of the  food .Incisors  and  canines      shear  and  tear   the  food  into   pieces ;premolar  and  molar  crush   and  grind  it  further  .Although   tooth  enamel  is  the  hardest   substance  in  the  body,it   tends  to  be  eroded  and  destroyed   by  the  acid  produced  in  the  mouth   during  the  breakdown   of  the  food.






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