I got out of the habit of posting my Registered Maine Guide tips, but here's a fun one you can try in your own kitchen.
Say you're on a camping trip and you forget your toothpaste. As counterintuitive as it seems, you can use strawberries to clean stains from your teeth and keep them white.
You can also use ashes from a wood fire to brush your teeth, but that's a considerably less tasty alternative. Hardwood yields more potassium hydroxide than softwood, so toss a piece of oak on the fire pit.
Monofilament fishing line can also work as dental floss, by the way.