If you travel to a third world country you will know that the quality of water coming out of the tap is more than suspect – it is undrinkable, and you should not even brush your teeth with it. Trouble is that even when you religiously use bottled water to brush your teeth, when you are tired, the sheer force of habit has you rinsing your tooth brush under the tap by mistake. I cannot tell you the number of times I have done that and then wondered if I was going to get sick. Now I take a travel toothbrush sanitizer with me which disinfects the tooth brush with UV light and so far so good- my stomach has survived my travels. Starting at $29.95.