In the UK, the safety of packing an electric toothbrush in checked luggage depends primarily on the battery type. If the toothbrush uses standard alkaline batteries (like AA or AAA), it is perfectly fine for checked bags. However, most modern electric toothbrushes use rechargeable lithium-ion batteries, which pose a fire risk in the cargo hold. According to UK Civil Aviation Authority (CAA) and general airline safety guidelines, devices with lithium batteries should ideally be kept in your carry-on luggage where the crew can access them in the event of a malfunction. While a small toothbrush is often overlooked compared to laptops, it is safer and often required to keep it with you in the cabin. Always ensure the device is switched off and protected from accidental activation, perhaps by removing the brush head or using a travel case, to avoid a buzzing suitcase that might cause security concerns.