The direct answer: tooth powder is not a liquid, so it does not count toward the TSA 3-1-1 liquids bag. Powders are allowed in carry-on luggage. The only powder rule worth knowing is that containers over 12 ounces, about 350 ml, may be pulled for separate screening, and a 35 gram jar of tooth powder is nowhere near that line.
The rules, plainly
TSA treats tooth powder as a powder, not a liquid, and powders fly free of the liquids bag. Toothpaste, by contrast, counts as a liquid and has to fit your quart bag in a 3.4 ounce tube. On international routes some airports apply the same over 12 ounce powder screening, so a small jar sails through where a bulk tub might get a second look. Nothing about a small jar of tooth powder requires declaring, bagging, or explaining.
Practical tips from people who travel with it
- Carry the travel jar, not the main jar. Our kit includes a small glass travel jar with a bamboo lid for exactly this, and any small tight lidded jar works.
- Keep it dry. Hotel bathrooms are humid. Dip with a dry or barely damp brush and close the lid promptly and the powder stays loose.
- Pack it upright in a sock or pouch. Glass is sturdier than people expect, but padding costs nothing.
- Security is faster without the tube. One less thing in the quart bag is a small pleasure that never gets old.
The honest tradeoffs
- A glass jar weighs more than a travel tube of paste. If you count grams, decant into something lighter.
- An open jar can spill in a bag where a tube cannot. Check the lid before you pack.
If you are new to the format entirely, start with what tooth powder actually is, and see how the formats compare for travel and everything else in our powder, paste, and tablets comparison.
This is a cosmetic product. It is not a substitute for professional dental care.