The short answer
Yes, toothpaste counts as a liquid (gel) for TSA. In your carry-on a tube must be 3.4 oz (100 ml) or less and go in your quart-size liquids bag. Full-size tubes can go in checked luggage. Toothpaste tablets are solid and have no limit.
Carry-on vs checked bag
| Item | Carry-on | Checked bag |
|---|---|---|
| Travel tube (3.4 oz / 100 ml or less) | AllowedIn liquids bag | Allowed |
| Full-size tube (4–6 oz) | Not allowedEven if partly used | Allowed |
| Toothpaste tablets | AllowedSolid, any amount | Allowed |
| Mouthwash | Limits3.4 oz (100 ml) or less | Allowed |
| Toothbrush, floss, electric toothbrush | Allowed | Allowed |
Check the size on the tube, not how full it is
TSA goes by the size printed on the container. A 4.8 oz tube that is half empty is still a 4.8 oz container and will be taken at the checkpoint. Most full-size tubes in the US are 4 to 6.4 oz, so they are over the limit. Travel tubes are usually 0.85 oz to 3 oz.
Frequently asked questions
Does toothpaste count as a liquid for TSA?
Yes. TSA treats toothpaste as a gel, so it follows the 3.4 oz (100 ml) rule in carry-on bags.
Can I bring a full-size toothpaste in my carry-on?
No, if the tube is labelled over 3.4 oz (100 ml), even if it is mostly used. Put it in a checked bag or use a travel tube.
Are toothpaste tablets allowed?
Yes. Tablets are solid and can be carried in any quantity.