hii huduma ipo shabbir dental clinic hapo city center; actually scientifically one has to go 4 dental check up after every six months ... so this bleeching can also be done after six months but not necessarily after six months; once u do the bleeching its permanent ila with time meno becomes yellow or dull in color ( comon for every1) so inorder to inhance the color u can do it every six months......... its nt very expensive!!