Training a doggy to stop biting will never only help you save from pain today however it could help you save from a lawsuit in future. Puppies which are not taught that it’s unacceptable to bite humans would grow into pets that use biting like a security system.
Even though biting is part of a puppy’s natural instincts you’ll have to show them appropriate biting behaviour. In a pack, pets use biting play to help establish dominance however any bite that’s too hard is instantly stopped along having a sharp bark and an end-of play.
Making use of this same technique you could guide your doggy to better behaviour. While you’re training a doggy to prevent biting, persistence may be the key.