Puppy biting and puppy mouthing are very normal behaviors for your puppy but those sharp little teeth can hurt. So your puppy needs to learn how to bite softly.
This is called bite inhibition.

To teach bite inhibition your puppy needs lots of opportunities to play with other puppies and adult dogs. If a puppy bites to hard during play, the play will abruptly
stop. This teaches your puppy that no one will play with me if I bite to hard. Over time the puppy learns to bite softly.

When you and your puppy are playing and the puppy bites you too hard. You need to yelp "OUCH" and stop playing as a consequence. Either leave your puppy alone or but him in time out for a minute.

Be consistent and your puppy will learn that he can't bite hard on human skin. Puppies need constant feedback about bite pressure without it they will grow up without the ability to control the force of their jaw. This could led to a damaging bite.

Allow puppy biting and mouthing until the puppy is reliable with a soft mouth and has good bite inhibition. Then play biting can be phased out and redirected to toys or a time out for biting.

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