Great question — answering as the UphillTech team:
Even for "multi-week" trips, brushing with water alone is not going to compromise your tooth health. The abrasive action of the brush does most of the work, and missing the flouride hit for a few days won't affect your teeth in the least. Plus, it saves weight. So, the best LNT option: don't use it . If you MUST use toothpaste (or an alternative), try a few of these options: Swallow it - pick up a toothpaste made for babies and children made with the explicit understanding it will be swallowed. (Even regular toothpaste says, "do not swallow more than used for brushing" which seems to indicate it won't hurt...) Pack it out - If you are truly leaving no trace, then you are packing out your...
Full answer by Lost: https://outdoors.stackexchange.com/a/9338 (CC BY-SA 3.0).
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