Stop Hand Biting with Proper Food Presentations

Many people feel they can not use food rewards with their dog because the dog bites their fingers or is too aggressive with the hand. This is a very common problem many dog owners experience with their puppies.
Eevee the Mal, was developing this problem but in a few short reps shown in this video she learned to take the food properly and her handlers learned to present the food properly to promote correct and safe taking of the food.
Here we see clear use of the "Yes, No, Good," Verbal marker system. Many people try to use more complicated language around behaviors they do not want. Such as Saying "No bite" Or "gentle" when the dog bites the hand. Unfortunately these additional signals can become cues for the very behavior we want to avoid.
If the dog receives reward/gratification when it bites our hand, whether that is the food reward or social/dominance gratification from our reaction, and we teach the dog a word that coincides/predicts this gratification we may actually be teaching the dog to bite us in the same way we teach the dog sit or down. The word we intend to mean don't bite us starts to actually mean "please bite us" since we pay the dog a reward when it happens. We overcome this by non-reinforcing the times the dog bites us with a "no" marker.
We can take this one step further by marking "no" when the dog turns its head to the orientation that would allow them to bite us. Instead we only mark the yes and provide the reinforcement when the dog's nose presses to the palm with the top of the head towards the wrist.

[@johncspine2787]

My problem is small kibble, trying to train heel, he gets aggressive and I start dropping the kibble and he gets even more bite-y..now the bitey has spread all the time, I’m worried he’s going to do this forever, he’s about 14 weeks old..

[@AudaxK9Academy]

Two things can help. Try a food size that is large enough you can hold it with your thumb and he can still see it. About the size of a nickle tends to be the smallest I use. Flat is better than spheres.
Then try a game we call "it's your choice" hold the food so he can see it. Star with fingers pointed down. If his nose pushes to your palm pay that. If he bites at your hand say no. Then pause. Next show him the food with your hand open. If he strikes at it close your hand and say no. If he looks at it, say yes and pay. The result: nose pushes get paid when your hand is vertical fingers down. Looks at the food get paid in all other cases. Let me know how this goes.