Toothpaste is allowed in carry-on luggage, but only in containers of 3.4 ounces (100 millilitres) or smaller

The TSA treats toothpaste as a gel or liquid, which means it falls under the 3-1-1 rule. This rule limits each container to 3.4 ounces (100 ml) maximum. A standard travel-size tube of toothpaste—typically 1 ounce or less—passes through security without issue. A full-size tube (usually 4 to 6 ounces) will be confiscated at the checkpoint if you try to bring it in your carry-on.

The rule applies to all toothpaste types: regular paste, gel, whitening formulas, and prescription toothpaste. The container itself must be 3.4 ounces or smaller; the amount inside does not matter. A half-empty 5-ounce tube will still be rejected because the container exceeds the limit.

Key Takeaways

  • Toothpaste containers must be 3.4 ounces (100 ml) or smaller to pass through TSA security in carry-on bags.
  • Travel-size toothpaste tubes, sold in most drugstores and supermarkets, meet the size requirement and are the simplest option.
  • Full-size toothpaste tubes will be removed at the security checkpoint, so pack them in checked luggage instead.
  • The 3-1-1 rule applies to all toothpaste—regular, gel, whitening, and prescription—with no exceptions.
  • Toothpaste in checked baggage has no size restrictions and can be packed in any quantity.

How the TSA's 3-1-1 rule works

The 3-1-1 rule is the TSA's standard for liquids, gels, and pastes in carry-on bags. It has three parts: each container holds a maximum of 3.4 ounces (100 ml), all containers fit into one clear quart-sized plastic bag, and each passenger carries only one bag. Toothpaste qualifies as a gel under this rule, so it must follow all three requirements.

The rule exists because the TSA classifies these substances as potential security risks in large quantities. A single small container poses minimal risk, but multiple large containers could theoretically be combined into something dangerous. The rule is not about the toothpaste itself being unsafe—it is about the volume allowed on the aircraft.

Travel-size toothpaste: the easiest option

Travel-size toothpaste tubes are sold specifically to meet TSA rules and are widely available. Most drugstores, supermarkets, and travel retailers stock them in the toiletries aisle. Common brands like Colgate, Crest, Sensodyne, and Tom's of Maine all make travel sizes, usually 1 ounce or smaller. A single travel tube costs between $2 and $5 and lasts several days to a week depending on use.

Buying a travel tube is simpler than decanting toothpaste into a smaller container, which can be messy and risks leaking into your bag. If you travel frequently, keeping a travel tube in your carry-on bag permanently saves time at every checkpoint.

What happens if you pack full-size toothpaste in carry-on

TSA officers will remove any toothpaste container larger than 3.4 ounces at the security checkpoint. You will not be allowed to board with it. The toothpaste is discarded—you cannot retrieve it later or have it shipped to you. This happens to thousands of travelers daily, so do not expect an exception.

If you discover the problem after passing through security, you cannot go back through the checkpoint to retrieve it. Plan ahead by checking your bag before arriving at the airport, or straightforward pack a travel size from the start.

Packing toothpaste in checked luggage instead

Full-size toothpaste has no restrictions in checked baggage. You can pack as many tubes as you want in any size. This is the option to choose if you prefer your regular brand and size, or if you are traveling with family and want to avoid buying multiple travel tubes.

Toothpaste in checked bags should still be sealed or placed in a leak-proof container, because pressure changes during flight can cause tubes to crack or leak slightly. Placing it in a small plastic bag inside your suitcase prevents it from staining clothes if a leak occurs. This is a precaution, not a requirement—most tubes survive the journey without incident.

International flights and other countries' rules

The TSA's 3-1-1 rule applies to flights departing from the United States. If you are flying internationally from a U.S. airport, the same rule applies to your carry-on bag. Once you land in another country, that country's aviation authority may have different rules for connecting flights or return flights.

Most major countries—Canada, the UK, Australia, and the EU—use the same 100 ml (3.4 ounce) limit for toothpaste and other gels. However, some smaller airports or regional carriers may differ. If you are connecting through multiple countries, check the rules of each country's aviation authority before you travel. Your airline can also confirm the rules for your specific route.

Other toiletries that follow the same rule

Toothpaste is one of many items governed by the 3-1-1 rule. Shampoo, conditioner, body wash, lotion, sunscreen, deodorant (cream or gel), and liquid makeup all count as gels or liquids. Solid deodorant, bar soap, and solid perfume do not count and have no size restrictions. Medications in liquid or gel form are also subject to the rule, though you can carry more than one bag of medications if needed.

All of these items must fit into a single quart-sized clear plastic bag along with your toothpaste. If you are packing multiple toiletries, you may run out of space in the bag before you reach the size limit. In that case, move the extras to checked luggage or leave them at home.

Frequently Asked Questions

Can I bring an electric toothbrush in carry-on luggage?

Yes. Electric toothbrushes are allowed in carry-on bags. The toothpaste inside must still follow the 3.4-ounce rule, but the brush itself has no restrictions. Batteries are allowed in carry-on bags as long as they are installed in the device or in a protective case.

What if my toothpaste tube says 3.4 ounces but looks full?

The TSA measures the container size, not the amount of product inside. If the tube is labeled 3.4 ounces or 100 ml, it will pass through security even if it is completely full. Tubes labeled 4 ounces, 5 ounces, or any amount over 3.4 ounces will be rejected regardless of how much toothpaste is actually in them.

Can I pack toothpaste in my personal item instead of my carry-on roller bag?

No. The 3-1-1 rule applies to all carry-on bags, including personal items like backpacks, purses, and small bags. Toothpaste must be in a container of 3.4 ounces or smaller and placed in your quart-sized liquid bag, wherever that bag is located in your carry-on luggage.

Do I need to remove toothpaste from my bag at security?

Yes. You must remove your quart-sized liquid bag—containing toothpaste and other gels or liquids—and place it in the security bin separately, just like you would with a laptop or shoes. This allows the X-ray machine to scan it clearly. After passing through security, you can put the bag back in your carry-on.

Can I buy toothpaste after I pass through security?

Yes. Once you are past the security checkpoint, you can purchase full-size toothpaste at airport shops, duty-free stores, or other retailers in the terminal. You can then bring it on the plane in your carry-on bag because it was purchased after security screening. This is a good option if you forgot to pack a travel size or prefer to travel without toiletries.