Please choose the correct ending to complete the given sentence: Health: [header] How to prevent bad breath [title] Brush your teeth properly. [step] Brushing your teeth properly is one of the best things you can do in your fight against bad breath. Brush at least twice a day, for at least two minutes and make sure to cover all the areas in your mouth.

Ending1: This helps to clean your teeth and prevents bad breath. [substeps] Before bed, make sure you brush your tongue, which should also be clean. Ending2: Brush until your gums feel soft and clean. Before you start brushing, brush your tongue and teeth to ensure that your teeth are clean and ready for brushing. Ending3: Especially focus on where the teeth meet the gums. [substeps] Use a soft bristled brush and replace it every three to four months. Ending4: Brushing the gums helps to prevent the buildup of plaque and cholesterol. [substeps] Brush your teeth for about 20 seconds on a regular basis.

Answer format: ending1/ending2/ending3/ending4