Whenever I brush my teeth it bleeds from my mouth,but m sure its not due to damage of teeth or gum,it will bleed by throat,from 2-3 years its happening with me... and now a days daily it bleeds..

Well since teeth bone they can't bleed.The bleeding is coming from your gums most likely.Gums are easily irritated so brushing up near your gums for an extended amount of time of brushing hard near your gums to get rid of that yellow custard color can make them bleed.This happens to everybody, but if it happens ever time you brush, or your gums become inflamed or sore, that may mean you have a dental issue that only your dentist can help you with. All in all if it's straight forward just don't brush so hard up near you gums. I hope that helped.