‘Tactical skills weblog Imminent Threat Solutions shares a simple method for making toothpaste dots by squeezing small, chocolate-chip sized “dots” of toothpaste onto aluminum foil, allowing those dots to harden for a week or so, and then transferring to a small waterproof bag. To use, all you need to do is pop a toothpaste dot in your mouth, chew for a few seconds, and start brushing.’ http://lifehacker.com/5979236/toothpaste-dots-keep-down-toiletry-bulk-when-carrying-light & http://gossamergear.com/wp/toothpaste-dots
Of course it is lighter still and just as effective to chew the end of a stick then use it as a brush without any toothpaste at all!