Please choose the correct ending to complete the given sentence: Health: [header] How to prevent morning breath [title] Brush and floss your teeth before bed. [step] Good oral hygiene is the key to fighting bad breath. Get in the habit of brushing and flossing your teeth after every meal and before bed to eliminate odor-causing bacteria in your mouth.

Ending1: [substeps] To floss correctly: cut off about 40 cm of floss. Wind the ends around the middle fingers of each of your hands. Ending2: Aim for just one quick brushing session, then practice all night. Brush and floss your teeth as well, so you keep them healthy and looking fresh. Ending3: Use the end of a toothbrush or a rotary tool with a pointed end to brush the top and sides of your teeth. [substeps] Keep your floss beneath your tongue and the shank side exposed to your breath. Ending4: Brush once a day and floss twice a day. [substeps] Make sure your teeth are clean before bed.

Answer format: ending1/ending2/ending3/ending4