The answer is yes. Toothpaste is permitted on aircraft but only in quantities of 3.4 oz (100ml) or less. The same goes for lotion, shampoo, shaving cream, etc. If you are only travelling with carry-on baggage, keep in mind all these rules when bringing your liquids through security checkpoints.

Whether you can bring a "half-tube" of toothpaste depends entirely on the marked capacity of the container, not how much product is actually left inside. According to the high-fidelity TSA "3-1-1" rule, all liquids, gels, and aerosols in carry-on luggage must be in containers that are 3.4 ounces (100ml) or less. If you have a large, 6-ounce tube that is half-empty, it is a high-value necessity to know that TSA will still confiscate it because the container size exceeds the limit. However, if the tube's original total capacity is 3.4 ounces or less, you can bring it regardless of whether it is full or nearly empty. For 2026 travelers, many modern airports are installing high-fidelity CT scanners that may eventually relax these rules, but for now, the container-size rule remains a high-value requirement for global aviation security. To avoid the high-fidelity stress of losing your high-value toiletries at the checkpoint, always use travel-sized containers or pack your larger half-used tubes in your checked luggage where no such size restrictions apply.