Have you taken your dog in to the vet so that they can check him? If he's in that much pain I would take him in asap! Pain can cause a dog to act out.
If the vet finds nothing wrong with his teeth I would get serious with some training. If this is purely behavioral related you want to nip his behavior in the bud now because at 5 months it's only the beginning. Teach your dog how you want it to behave and what it should do instead when it does something wrong.
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My Pack;
Wrigley/6 y.o. male, Lhasa mix
Kuma/1 y.o. female, Akita
A rolled up newspaper can be an effective training tool when used properly. For instance, use the rolled-up newspaper if your dog chews up something inappropriate or has a housebreaking accident. Bring the dog over to the destroyed object (or mess), then take the rolled-up newspaper and hit yourself over the head as you repeat the phrase,"I FORGOT TO WATCH MY DOG, I FORGOT TO WATCH MY DOG!"
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