- Just ate gluten
- Just drank a beer
- Just used toothpaste or mouthwash that contains gluten
- Wears lipstick with gluten
What to do? One option is to make sure that before you kiss each other, the gluten-eating partner always brushes with a gluten-free toothpaste and then flosses. A more romantic approach is for both partners to eat gluten-free.
I don't want to get too graphic here, but if you're a gluten-free guy who's kissing a girl who wears lots of make-up, she needs to be sure that the cosmetics she uses on or near her mouth are gluten-free. Here's an excellent list of gluten-free cosmetics. Everyone else, please remember: gluten molecules don't pass through skin, so you only need gluten-free personal care items if there's a risk you might swallow them.
P.S. Don’t forget to brush any gluten crumbs out of mustaches.