Toothbrush makes newborn kitten purr

From @kellyfosterkittens: “Goooood morning! ❤️ A toothbrush feels like a mother cat’s tongue, providing comfort and cleaning them! Can you tell by the purrs that Luna is enjoying this? 🥰” #catsofinstagram pic.twitter.com/VVUjuIC5FV

— Cats of Instagram (@catsofinstagram) November 12, 2020

This tiny kitten thinks the toothbrush is her mother's tongue so she enjoys being "licked" by her mother. She starts to purr and offers up her chin for a wash. I think it is the first time that I've heard such a young kitten purring and you can see her left arm juddering slightly in pleasure. That is my reading of her behaviour. It is a form of feline allogrooming only the human is using a toothbrush very gently to simulate an adult cat's tongue.