It's an easy trap to fall into: you stay round his house for the first time, you haven't thought to bring a toothbrush, and so you just use his because it's to hand (heaven forbid he lives with his family and you've chosen one at random). Dental hygiene is a pretty personal thing. Would you like to share your toothbrush? If he doesn't mind you doing it, fine. But probably ask first.
I love Stephen King and music festivals; I eat my toast upside down; I daydream about getting married probably a bit too much; and I wish every day for a pet sausage dog puppy (who never materialises – sob).
