The Refillable Toothbrush is a cost-effective option that saves you money and space in your travel bag. The Refillable Toothbrush has a clear, acrylic chamber that holds about a 1/2 oz of your favorite toothpaste, adhering to TSA regulations for carry-on items. This amount of toothpaste you can brush your teeth between 20 and 30 times. When you are ready to brush your teeth, twist the white dial located at the bottom of the toothbrush and the toothpaste will travel through the handle and be neatly distributed on top of the soft, standard size bristles. The Refillable Toothbrush also comes with a clear plastic cap that covers the bristles and protects it from airborne germs and bacteria.