Toothpaste on a Plane: TSA Carry-On Size Limit

Where these numbers come from

TSA counts toothpaste as a paste, which puts it inside the 3-1-1 liquids rule. In a carry-on, each tube must be 3.4 ounces (100 milliliters) or less and ride in your single clear quart-size bag. In checked baggage there is no size limit on toothpaste.

Tube size is read off the label. A 4.6-ounce family tube with only a dab left is still over the limit, and screeners generally go by the printed size. Travel tubes of 0.85 to 3 ounces are safe choices. A standard 6-ounce tube is over the line, so put it in your checked bag or buy a small one at your destination.

Space in the quart bag matters more than the ounces. A typical bag holds toothpaste, a contact lens solution bottle, a small face wash and a deodorant gel with little room left. If you fly with several people, each traveler gets a bag, which lets one person carry the toothpaste for the group.

Toothpaste tablets solve the problem entirely. They are solid, so they skip the liquid rule and need no quart bag. A tin of 60 tablets covers a month of two-a-day use for one person. Tooth powder is also solid, though powders can draw extra screening and should be in a labeled container.

Toothpaste prescribed for a medical need, such as high-fluoride paste, can be carried above 3.4 ounces. Declare it at the checkpoint and expect an extra look. For more detail on how these exceptions work, see the liquids rule page and the medications page. Compare with the deodorant rules, where stick and gel forms are treated differently.

International airports may use a different cap. Some European airports with new scanners now allow larger containers, but a connection to the US resets you to the TSA standard. Kids' toothpaste and whitening gels follow the same rule, because they are also pastes or gels. A 4-ounce tube of whitening gel is over the limit even if the box says travel. Sample-size tubes handed out by dentists are usually under an ounce and make ideal carry-on pieces. Keep them in the quart bag with any mouthwash, which is a liquid and follows the same 3.4-ounce cap.

Sources

• TSA liquids rule (3-1-1)
• TSA toothpaste item page (as quoted by Security Wait Times)

Figures checked on September 30, 2026.

This page is general information, not legal, insurance or travel-agent advice. Fees, rules and limits change, so confirm the figures with the official sources listed above before you book or travel.