You can bring a travel toothbrush on board. Electric toothbrushes are not prohibited items for airlines, and they are small and light, usually not exceeding the limits for personal liquid and battery products. In addition, electric toothbrushes can be carried on board or checked in.
It should be noted that if the electric toothbrush contains a battery, according to the airline's regulations, portable electronic devices containing lithium batteries such as electric toothbrushes, Bluetooth headsets, laptops, etc. need to be carried on board and cannot be checked in.