It is customary for Greeks to
    use Garlic to ward off evil.  Garlic is believed to ward off demons and
    evil spirits in the same manner that incense does.  Demons and evil
    spirits are believed to fear it.
    Garlic can be worn in the
    clothes of an individual to ward off evil. If you find garlic hanging in
    Greek businesses or houses it is there for the purpose of warding off
    evil.   
    Garlic is believed to be very
    effective against The Evil Eye.  Please check The Evil Eye.