Control the dog’s mouth strength

Play with the puppy with both hands until you feel it bites you harder than you are comfortable with. When it does this, you can imitate the barking and squealing of a dog, and then stop playing with it for a while.
Young puppies often don’t know how strong their mouths are, so they will bite each other just for fun without understanding the sensitivity of the person or companion. A puppy usually only knows if it bites too hard after playing with other puppies a lot. The puppies will nibble at each other until one of them is bitten so hard that he growls loudly. In this case, the bitten party stops playing, and the biting party is startled and temporarily stops playing.
After a while, the two puppies started playing together again and fighting each other. If one of the puppies happens to bite too hard again, the same thing will happen again and both puppies will flinch slightly. This feedback loop allows the erring puppy to learn that its nipping actually hurts other puppies (and people), thereby improving its behavior. If your puppy licks you or tries to comfort you, praise him and/or reward him. If you use a clicker to train your puppy, you have to click the clicker immediately when its mouth lets go of your hand or bites you less hard.
Although it is a natural reaction to quickly withdraw your hand when it is in pain, it may actually encourage your puppy to play more aggressively and continue to bite you. On the other hand, a weak-looking hand is no fun at all.
You want to express that you encourage gentle play but disapprove of rough play. Play with your puppy until the same thing happens again, repeating the steps of ignoring or leaving.

Control training time

Do not repeat these steps more than 3 times within 15 minutes. Overly repetitive things will not clearly convey the message you want to convey, and the puppy will not be able to learn to stop biting and will only continue its original behavior.
If the puppy is indifferent to your yelling or scolding, you can try using the time-out method. If yelling alone doesn't work, you may need to take a break. When the puppy bites harder than you intended, you can yell and remove your hand to indicate that play has stopped. Ignore the puppy for 20 seconds.
If the puppy continues to bite you, get up and leave for 20 seconds. Once the 20-second time limit is up, you can go back and play with the puppy again.

Teach good habits

1. Encourage puppies to play with other friendly puppies or adult dogs. Every puppy spends its early years playing with other vaccinated dogs. This is a time of exploration and learning, just like your own childhood.  

Some other dogs don't need you to "act out" and learn to control their bite naturally. Playing with such a puppy regularly will encourage it to play better with you and other dogs. Consider signing up for puppy training classes so your dog can learn basic skills while having fun.
2. Whenever your puppy bites you, replace your skin with his favorite bone or teething toy. Give your dog a favorite toy or bone to chew on. This helps the puppy learn that teeth should be placed on toys or bones, not your skin.
3. Play other games. Playing roughly with your puppy with your hands can be fun, but it can also convey the wrong ideas to your puppy. Encourage play that does not involve biting fingers, hands, knees, and toes. Learn how to play fetch with your dog and follow the rules every time. Learn to play tug-of-war with your dog. Follow the same rules to encourage your puppy not to bite when near your hand. Prepare many interesting and novel toys for your dog to play with. A bored dog will bite you to get your attention. Recycle toys so your dog doesn't get bored easily. 4. Use taste deterrents (such as anti-licking spray) to prevent dogs from biting. Before playing with your dog, spray a taste deterrent on the parts of your dog's body or clothing that like rough play. When it starts to bite you, stop all your movements and wait for it to react to the taste deterrent. When it releases you, praise it and continue playing with it. Spray taste deterrent on your body and clothes for at least two weeks. Over time, your puppy will most likely develop an aversion to your hands and ankles. 5. Make sure the puppy gets sufficient exercise. A puppy that gets plenty of exercise will be less rude when playing with you. This will prevent bad habits from forming in the first place.

Be patient

This may take a few months, but it will be worth it. Don’t treat dogs the same way you treat people. At some point you may be tempted to physically punish your pet by slapping, slapping, or yelling at her. The problem is that these actions can only lead to one of two outcomes: encourage it to continue playing rough, or encourage it to launch a real attack. Avoid other forms of physical punishment that may frighten or threaten your puppy. Don’t stop the normal way of having fun. You may not enjoy getting bitten every time you play with your puppy, but you also want to develop a real bond with your puppy.Friendship, and having fun with it is one of the ways to build a relationship. Don’t give up playing with your pet just because it doesn’t know how to play gently. It’s best for you and your dog to teach her the difference between right and wrong rather than giving up on playing with her.