Thank you friends for all your responds
This is the only ting I found

((Wipe out his dignity

What does a "Mistress" do to break slave?

Well, based on the sources about slavery within all countries and civilizations it can be a beating, verbal abuse, or simply the dehumanization that takes place for extensive amounts of time.))

True training exist to make his service much better but breaking his is to guaranty that he will be yours for a long time and insure his slavery and loyalty to you