BLANCA travel oral care at airport security

100 mL Toothpaste on Canadian Flights: What CATSA Lets You Carry

Yes, toothpaste is allowed in carry-on luggage from Canadian airports only in a tube labeled 100 mL (3.4 oz.) or less, placed in your single clear 1 L resealable bag. Larger tubes need to go in checked baggage or be purchased after security. Both CATSA and Air Canada confirm this standard for every domestic and international departure.

TL;DR:

  • Only tubes of toothpaste labeled 100 mL or less are permitted in carry-on liquids, and they must fit inside a single clear 1-liter bag.
  • Larger tubes need to be packed in checked luggage or purchased after security, regardless of how much toothpaste is left inside.
  • A 4 oz (about 118 mL) tube exceeds the size limit and must go in checked baggage, even if nearly empty.
  • Medical exemptions, such as baby formula or prescription medicine, are allowed additional flexibility but must be declared during screening.
  • Using travel-sized products or tooth powder can simplify packing and avoid liquid restrictions altogether.
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What the official Canadian rules say about toothpaste

Toothpaste falls under the same category as shampoo, lotion, and other gels when you reach security. CATSA classifies it as a liquid or gel, which means it answers to the same 100 mL per-container limit that governs everything else in your toiletry bag. The rule applies regardless of how much product is actually left inside the tube. What matters is the number printed on the label.

Every passenger is also limited to one bag for all these items, and the bag has to meet specific criteria:

  • The bag must be clear and resealable, holding about 1 liter (1 quart) total.
  • Approximate dimensions run 15.24 cm by 22.86 cm, or 20 cm by 17.5 cm.
  • Every liquid, gel, or aerosol you carry on needs to fit inside that one bag, toothpaste included.

It helps to separate two things that often get confused: your airline’s carry-on baggage allowance and the security screening rules enforced at the checkpoint. Air Canada’s own carry-on baggage guidance addresses what you can bring aboard in terms of bag size and count, but it is CATSA that decides what goes through the X-ray line, and CATSA’s 100 mL rule always wins when the two seem to overlap.

How to pack toothpaste for carry-on without a hassle

A little preparation at home saves time and stress at the airport. Follow these steps before you leave for your flight:

  1. Check the label on your toothpaste tube and confirm it reads 100 mL or less; if it does not, transfer a smaller amount into a travel container rated at 100 mL or under.
  2. Place the tube inside your clear 1 L resealable bag along with your other liquids and gels, leaving the bag easy to reach in your carry-on.
  3. At the checkpoint, be ready to remove the bag from your luggage if an officer asks and place it in a bin on its own.
  4. Watch for instructions specific to the CT scanning lane you’re in, since some lanes allow liquids to stay inside bags without separate bins.

A pre-labeled travel tube removes any guesswork at the scanner, and it is one less thing to think about when you are already juggling boarding passes and a jacket.

Pro Tip: Keep a dedicated travel-size toothpaste tube packed year-round so you never have to transfer product the night before a trip.

Checked baggage and alternatives when your tube is too big

Full-size toothpaste tubes, the ones you buy for home use, almost always exceed 100 mL. If you want to bring a larger tube, pack it in your checked baggage rather than your carry-on. Checked luggage has no liquid volume restriction for toothpaste.

If checking a bag isn’t an option, a few alternatives work just as well:

  • Buy travel-size toothpaste once you’re past security, since most airport shops carry compliant sizes.
  • Switch to toothpaste tablets or tooth powder, which sidestep the liquids rule entirely.
  • Remember that screening officers judge a tube by its labeled capacity, not by how much is left inside, so a half-empty 150 mL tube is still treated as oversized.

Common edge cases: 4 oz tubes, partial tubes, and medical exemptions

A few scenarios trip up travelers more than any other, so it helps to settle them before you pack.

  • A 4 oz tube works out to about 118 mL, which puts it over the 100 mL ceiling. It is not permitted in carry-on, even though 4 oz sounds close to “travel size.”
  • A tube printed with a capacity over 100 mL is treated as oversized at the checkpoint no matter how much toothpaste is actually left inside, so it needs to go in checked luggage instead.
  • Baby formula, breast milk, and prescription medicines are exempt from the standard liquids limit, but you still need to declare them to the screening officer and expect additional inspection.

Travelers managing medical equipment or specialized care needs around a trip sometimes also look into local support options, such as medical equipment rental services in Canada, to simplify logistics before a flight.

Practical travel tips from an oral care brand

We see plenty of questions about which oral care products travel well. Our general advice: choose tubes labeled under 100 mL, or consider toothpaste tablets and tooth powder if you’d rather skip the liquids bag altogether. Always double check that the label meets the standard before your flight, since packaging sizes vary between brands and regions. For more on how whitening products specifically should be labeled and stored, our guide to Canadian dental whitening standards covers what to look for.

Carry-on toothpaste options and label check

Why clear packing rules matter more than they seem

Airport security can feel tense, especially when you’re unsure whether a product will get pulled at the checkpoint. The good news is that the 100 mL rule is consistent and predictable once you understand it. Check the label, use one clear 1 L bag, and pack a backup tube in checked luggage if you’re traveling with a larger size. A few minutes of preparation at home turns the security line from a guessing game into a formality.

— Blanca

Travel-friendly oral care options from BLANCA

We know packing for a flight already comes with enough decisions, so we recommend a few products with compliant sizing in mind. Rather than scrambling to find a travel tube the morning of your trip, you can stock up ahead of time with options built for travel.

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  • Our oral care collection includes compact essentials like the BLANCA Manual Toothbrush and BLANCA Mint Silk floss, both sized for a carry-on bag.
  • Our whitening collection offers the BLANCA Gel Whitening Pen, a compact format that’s easy to tuck into a liquids bag alongside your toothpaste.
  • Always confirm the printed volume on any product before you fly, since labeling requirements apply to whitening gels and pens the same way they apply to toothpaste.

Browse our full oral care lineup to find travel-ready picks before your next trip.

FAQ

Can I bring a 4 oz toothpaste on a plane?

No. A 4 oz tube works out to roughly 118 mL, which is over the 100 mL carry-on limit. You’d need to pack it in checked baggage or swap it for a smaller tube instead.

What size toothpaste can I take on Air Canada?

Air Canada follows CATSA’s screening rule of 100 mL (3.4 oz.) or less per container for carry-on. Anything larger needs to go in checked luggage or stay unpacked until after you clear security.

Is 3.4 oz of toothpaste travel size?

Yes, 3.4 oz equals exactly 100 mL, the maximum size CATSA permits per container in carry-on bags. Most products labeled “travel size” are made to match this exact threshold.

Is the 100 mL rule gone in Canada?

No, the rule is still active. CATSA’s recent guidance reaffirms the 100 mL per-container limit and the single 1 L resealable bag requirement for 2025 and 2026, so any claims that it’s been dropped are inaccurate.

Sources

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