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Dental issues can be very serious, especially if you are noticing a bad smell and seeing loose teeth. Your dog needs a complete dental evaluation by your vet and extraction of bad teeth, including the loose teeth. There is not much you can do at home for him now, as his mouth may have painful teeth that could be causing infection. However, after his mouth is fully examined and all the bad teeth are removed, you can safely start a home care program to maintain healthy teeth and gums.