If you’re traveling with an electric toothbrush—especially one powered by a lithium-ion or lithium-metal battery—the Transportation Security Administration (TSA) strongly advises against placing it in your checked baggage. The warning stems from the fire risk associated with lithium batteries, which can overheat or catch fire if damaged or exposed to pressure in the cargo hold. Instead, TSA recommends that travelers pack battery-powered toothbrushes in their carry-on luggage where any potential hazards can be monitored and addressed immediately by the flight crew. This guideline is consistent with broader TSA policies regarding devices containing rechargeable batteries such as laptops, e-cigarettes, and cameras. While it may seem like a minor item, failing to follow these recommendations could not only endanger the flight but may also lead to delays or confiscation during security screening. So, next time you pack for a trip, double-check your toothbrush—and make sure it flies in the cabin with you.