First, I have never owned a dog that chewed it's food (unless it's big chunks of raw meat)...I do know that it happens...but, never in my house
When I am bringing up puppies (last litter my girl had 7
). I feed them a few small meals throughout the day instead of once a day, or even just twice a day. For a 4 month old pup I have them cut back to 3 meals a day. I have always added water to kibble and canned food...much better for the kidneys. I have never fed just dry kibble and my dogs have had perfect health and healthy organs through old age.
I would never rely on a kibble as a dental aid
In many cases I have seen MORE dogs, especially smaller breeds suffer from tarter build up due to chewing or crunching on kibble.
If you haven't wormed your puppy yet, then it is something you should do. Most puppies are born with round worms (unless their mother has never had roundworms...roundworms can stay dormat in a female dog then the hormonal change when pregnant will infect the pups with worms.). I usually treat with Drontal plus (obtained from Vet only), then I follow up in 2 weeks with Strongid T. You have to follow up with the round worm treatment in 2 weeks to kill the eggs.
Good luck