"if you break a mirror, your fate will have to confront 7 years of bad luck, unless you completely defend and pave out a way to counteract the ill-effects," goes an ancient saying. of course those who believe in karma know she is a revengeful bitch, so it is obvious that to get rid of your bad luck from breaking a mirror, you are o get your hands dirty.
But before getting down and dirty lets find out the reason which illicits the Bad Karma.
Further the Romans believe that the human body revives every seven years.
So if you have your soul trapped in a mirror, it would take your soul seven years to be fully restored. In the meantime, life for a mirror breaker would be followed by a chain of unfortunate events, as the person has no longer had a healthier soul to ward off the evil spirits.