If it's just an overnighter I bring a toothbrush but no dentrifice. I still brush, but I read an article by a dentist who said your teeth won't fall out if you skip toothpaste for a day or two.

I don't use a dentrifice when water is scarce. I brush with water only and swallow it. It takes less water to rinse off the brush too.

I always carry floss for my teeth and as emergency repair thread.

If I really want to wallow in the lap of luxury I carry a small travel size (2 ounces?) container of mouthwash.

Slight hijack alert (sorry Earthling):

Has anyone ever tried one of these? Lighter/smaller than a full toothbrush but I would want to wash my hands very well before using one especially after I poo in the morning. I tend to use my dominant hand for everything if you get my drift <img src="/forums/images/graemlins/grin.gif" alt="" />
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If you only travel on sunny days you will never reach your destination.*

* May not apply at certain latitudes in Canada and elsewhere.