YOU SAID:
dog's mouths are cleaner than human mouths
INTO JAPANESE
犬の口は人間の口よりきれいです
BACK INTO ENGLISH
The mouth of a dog is more beautiful than the mouth of a human being
INTO JAPANESE
犬の口は人間の口よりも美しい
BACK INTO ENGLISH
Dog mouth is more beautiful than human mouth
INTO JAPANESE
犬の口は人間の口よりも美しい
BACK INTO ENGLISH
Dog mouth is more beautiful than human mouth
That didn't even make that much sense in English.