In 2026, you can bring Colgate toothpaste on a plane, but its placement depends on the container size. Per the TSA's 3-1-1 rule, toothpaste is classified as a "paste" (liquid/gel category). If it is in your carry-on, the tube must be 3.4 ounces (100ml) or less and fit inside a single quart-sized, clear plastic bag. Most standard full-size Colgate tubes exceed this limit and will be confiscated at security. However, there are no size restrictions for toothpaste packed in checked luggage; you can pack as many large tubes as you wish. For 2026 travelers, "travel-sized" Colgate tubes (usually 0.85 oz or 2.4 oz) are the easiest way to maintain dental hygiene while flying without having to surrender your supplies to airport security agents.