Dog dental infection- Natural remedy?

My Westie mix 16 years old has a terrible dental infection. The dog needs help getting around and I hand feed him now. The vet gave antibiotics and thinks the animal is on his way out because his body temp was 2 deg. lower than normal. I know his temp is back up there -and he is eating and drinking better now. I do not want to put my little friend to sleep because of a dental infection and he is too old and not strong enough for to survive surgery. Any safe natural remedies? Any help with this would be appreciated!