Dogs mouths are cleaner then ours - there shouldn't be a concern as dogs saliva is designed to start to neutralize bacteria - plus a raw diet, munching bones will clean the teeth - kibble gets mushy and gets stuck in the teeth and gums allowing for bacteria to proliferate - so you have more of a chance of getting bacteria kisses from a kibble dog - not to mention gum disease (doggie that is) and harmful drugs to have him put under to have cleaned - and the oh so unwelcome dog breath.
My dog gets a bit of saliva on his chin or side of mouth, I just wipe off with my hand and wash off.
Clean up area he eats w/ a 50/50 vinegar/water solution
He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion. - Unknown