How long will a travel-size tube of toothpaste last on a long-distance hike (or any other circumstance for that matter)? We analyzed four different tubes of travel-sized toothpaste to find out. We measured overall weight of the new tubes and then weighed various quantities of toothpaste to illustrate what different volumes of toothpaste looks like.

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The American Dental Association recommends a pea-size amount of toothpaste, which is about 0.25 grams of toothpaste. From this data we were able to calculate the theoretical number of uses in each tube of toothpaste.

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Four common travel-size toothpaste tubes.

I used a calibrated balance to weigh the toothpaste. Here you can see 0.515 grams of toothpaste, which is a larger volume of toothpaste than recommended by the American Dental Association.

## Weighing Toothpaste

This large application of toothpaste (0.80 grams) is more than three times the application recommended by the American Dental Association. This overuse of toothpaste will deplete a travel-size (24 grams) tube of toothpaste in about two weeks when brushing twice a day.

This pea-size application (0.25 grams) of toothpaste is the amount recommended by the American Dental Association. This is the optimal amount of toothpaste to use and will deplete a travel-size (24 grams) tube of toothpaste in about 48 days, or almost 7 weeks, when brushing twice a day.

This medium application of toothpaste (0.52 grams) is more than two times the application recommended by the American Dental Association. This overuse of toothpaste will deplete a travel-size (24 gram) tube of toothpaste in about three weeks when brushing twice a day.

This tiny application (0.08 grams) of toothpaste should not be used because it is less than the American Dental Association recommended amount.

## Conclusion

Different brands of travel-size toothpaste tubes are very similar. Any one of them should last for about 48 days if you use the recommended pea-sized amount twice a day. ( To determine the number of applications for your tube of toothpaste, take the content weight in grams and divide by 0.25.)

## Money-saving Refill Tip

You can save money by refilling your travel toothpaste tube from a larger toothpaste tube.

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Place the empty travel toothpaste tube firmly against the larger toothpaste tube. Gently squeeze the larger toothpaste tube to transfer the toothpaste.