Can You Bring Toothpaste in Your Carry-On? TSA’s Size Rule
Toothpaste over 3.4 oz (100 ml) can't fly in your carry-on, even nearly empty. TSA's exact cutoff, solid alternatives, and what to pack instead.
The short answer
Can you bring toothpaste on your carry-on? Yes, if the tube is 3.4 oz (100 ml) or smaller and fits inside your one quart-sized, clear bag with your other liquids. TSA checks the size printed on the tube, not how much paste is actually left inside it, so a nearly empty 6 oz tube still fails. Toothpaste tablets, powder and solid bars skip the limit entirely, and a full-size tube travels with no restriction in checked luggage.
Most people packing the night before a flight assume toothpaste is too ordinary to cause a problem at security. Then the tube in the bathroom cabinet turns out to be a 6 oz family size, half used, and the question becomes whether “half used” counts for anything at the checkpoint.
It doesn’t. This works through exactly where the size cutoff sits, what solid alternatives avoid the rule completely, and how the same math changes if your itinerary starts outside the US. Every figure below is checked against TSA’s own published guidance, current as of September 2026.
If you are also sorting out what else fits in that bag, what actually counts as a carry-on and carry-on size by airline cover the container your toothpaste has to share space in.
What you need to know before you pack
- One quart-sized, clear, resealable bag, one per passenger
- Every toothpaste tube in that bag printed at 3.4 oz (100 ml) or smaller
- A tube’s printed size, not its remaining contents, decides whether it fits
- Toothpaste tablets, powder and solid bars are exempt from all of this
- An oversized tube goes in checked baggage instead, where there is no size limit at all
- If you are also packing a razor or curling iron, TSA’s rules cover those by item type too, separately from anything liquid
Is toothpaste actually a liquid under the 3-1-1 rule?
Yes. TSA’s own rule covers “liquids, aerosols, gels, creams and pastes,” and a paste is named outright, so standard toothpaste qualifies even though nobody pours it like water. The same wording is why gel toothpaste, whitening paste and children’s fluoride paste all follow the identical 3.4 oz cutoff, regardless of flavor or brand.
Toothpaste only escapes this category when it stops being a paste at all. A general breakdown of what counts as a liquid covers the same solid-versus-flows test for deodorant, lotion and makeup, and toothpaste is judged by the exact same standard.
The limit is on the tube, not what’s left inside it
This is the detail that catches most travelers. TSA measures the container’s printed capacity, not how much toothpaste is actually inside it. A 6 oz tube squeezed down to its last inch is still a 6 oz container, and it gets pulled at the checkpoint exactly like a full one.
Only a tube printed at 3.4 oz (100 ml) or less passes, no matter how empty a larger one looks. If your only toothpaste is a full-size tube, the fix is buying a travel-size tube before you leave, decanting into a smaller labeled container, or checking the full-size tube in your luggage instead.
Solid toothpaste that skips the rule entirely
Toothpaste tablets, tooth powder and solid toothpaste bars hold their shape at room temperature, so none of them meet TSA’s test for a liquid, gel, cream or paste. They can travel in a carry-on in any quantity, with no bag and no 3.4 oz ceiling.
| Format | Counts as a liquid? | Carry-on limit |
|---|---|---|
| Standard paste tube | Yes | 3.4 oz / 100 ml |
| Gel or whitening tube | Yes | 3.4 oz / 100 ml |
| Toothpaste tablets | No | None |
| Tooth powder | No | None |
| Solid toothpaste bar | No | None |
Frozen toothpaste is not a workaround. TSA does allow frozen liquids through if they are frozen completely solid at the moment of screening. Toothpaste that has softened even slightly by the time it reaches the X-ray belt is treated as a normal paste again.
What if your tube doesn’t fit the limit?
Three options, none of which involve arguing at the checkpoint. Buy a travel-size tube once you land, decant your usual toothpaste into a labeled 3.4 oz container before you leave, or pack the full-size tube in a bag you are checking, where TSA’s carry-on limit does not apply at all.
Checked baggage has no size restriction on toothpaste or any other toiletry. If your trip already includes a checked bag for other reasons, that is the simplest place for a full-size tube. If you’re checking a bag for the first time on this trip, Delta’s baggage policy, and every other major airline’s covers what else that decision involves.
Exceptions that let a liquid travel over 3.4 ounces
None of these apply to ordinary toothpaste, but they cover the liquids most often confused with it.
- Medically necessary liquids and medication. Prescription and over-the-counter medication, along with things like saline and contact lens solution, can exceed 3.4 oz if declared to the officer before screening starts.
- Breast milk, formula and toddler food. These travel in any quantity, do not need to fit the quart bag, and do not require the child to be present or traveling with you.
- Frozen liquids. Allowed only while completely frozen solid at the time of screening; anything slushy or partly melted reverts to the standard 3.4 oz limit.
A widely repeated claim that hand sanitizer gets a bigger allowance is out of date. That exception was temporary during the pandemic and has since ended: hand sanitizer is back to the standard 3.4 oz limit like any other liquid.
Does TSA PreCheck change the toothpaste rule?
No. TSA PreCheck lets you leave your 3-1-1 bag inside your carry-on instead of pulling it out for separate screening, along with skipping shoe and light-jacket removal. The 3.4 oz size limit and the one-quart-bag rule apply exactly the same either way. PreCheck buys convenience at the checkpoint, not a bigger tube.
Do CT scanners change any of this in 2026?
Some checkpoints, mostly at major hubs like Atlanta, JFK, Los Angeles, O’Hare and Dallas Fort Worth, now run computed tomography scanners. These let travelers leave a compliant 3-1-1 bag zipped inside their carry-on during screening, and TSA has said the long-term goal is to extend that convenience everywhere.
As of September 2026 the rollout is lane by lane, not airport-wide, and it changes nothing about the size limit itself. A tube inside a CT-scanned bag still has to be 3.4 oz or smaller to pass; it is only screened without coming out of the bag first. Check the signage at your specific checkpoint rather than assuming either way.
How the rule compares outside a US airport
The same idea, a small container limit plus one resealable bag, holds across most Western airports, but the exact numbers shift by country.
| Country | Container limit | Bag limit | One bag per traveler |
|---|---|---|---|
| United States (TSA) | 3.4 oz / 100 ml | 1 quart bag | Yes |
| United Kingdom | 100 ml | 1 litre bag | Yes |
| Canada (CATSA) | 100 ml / 100 g | 1 litre bag | Yes |
A UK or Canadian departure follows its own regulator’s rule, not TSA’s. A tube that clears US security on the way out can still need to meet the same 100 ml cutoff on a connecting flight home.
What happens if your toothpaste gets pulled at the checkpoint
An oversized tube does not get a warning first. An officer removes it from your bag during screening, and once it is surrendered, TSA does not return it or reimburse its cost.
Some checkpoints have a bin, a mailing kiosk, or an option to step back and check the item if you have not yet gone through the ticket counter. Plenty of smaller airports have none of those, and the tube is simply discarded.
Nothing about the limit is negotiable at the belt itself. The officer enforcing it is not the person who can grant an exception.
What if it still gets flagged at the checkpoint?
- Ask which item triggered the stop, since toothpaste is sometimes flagged alongside something else in the same pouch.
- Declare a medically necessary paste or gel before screening starts, not after an officer questions it.
- Offer to check the tube instead of arguing further, if you have not yet gone through the ticket counter.
- Look for a mailing kiosk near security. Several major US airports keep one specifically for items that don’t clear the checkpoint.
- Contact TSA afterward through its Customer Service channels if you believe a clearly solid item, like a toothpaste bar, was misclassified as a liquid. It won’t recover a surrendered item, but it flags the error for the next traveler.
Frequently asked questions
In short
A toothpaste tube passes a US checkpoint at 3.4 oz (100 ml) or smaller, judged by what’s printed on the tube rather than how much is left inside it. Tablets, powder and solid bars skip the limit outright, and a full-size tube always has a home in checked luggage, where the rule doesn’t apply at all.
Rules change without much notice. If something here no longer matches what you were told at the checkpoint, tell us and we will correct it.
Sources
- TSA: Liquids, Aerosols, and Gels Rule
- TSA: What Can I Bring? Toothpaste
- TSA: What Can I Bring? Ice
- TSA: What Can I Bring? Hand Sanitizers
- TSA: Is Breast Milk, Formula and Juice Exempt from the 3-1-1 Liquids Rule?
- TSA PreCheck
- TSA: Computed Tomography
- UK Government: Liquids in Hand Luggage
- CATSA: Liquids, Non-Solid Food and Personal Items
