Please choose the correct ending to complete the given sentence: Health: [header] How to keep a clean toothbrush [title] Do not store your toothbrush in a closed container at home. [step] The greater moisture in a closed container creates a good environment for the growth of bacteria. [substeps] Keep your toothbrush in a container when you travel to avoid it picking up dirt or bacteria.

Ending1: [title] Clean the toothbrush's handle first. [step] Whether from a window or countertop, check the handle of the toothbrush before using it. Ending2: [title] Prevent bacteria from growing on the toothbrush. [step] Bacteria thrive on moisture and can easily develop on the bristles. Ending3: Be sure your toothbrush is dry before putting it in the protector or case. Also, be sure to clean your toothbrush protector regularly. Ending4: You may always clean your toothbrush with a little water and dish soap, but bacteria will pass if it is continually in your mouth or kept in a container. [title] Rinse the toothbrush every day.

Answer format: ending1/ending2/ending3/ending4