Please choose the correct ending to complete the given sentence: Health: [header] How to keep teeth white while smoking [title] Brush your teeth. [step] Although this is important for everyone's dental health, tooth brushing is especially important for keeping a smoker's teeth white. Brush your teeth twice to three times a day, being sure to brush for at least two minutes each time.

Ending1: [substeps] Remember to always brush before and after you smoke, as this can help prevent your teeth from getting inflamed. You can also use toothpaste when you blow. Ending2: Clean your mouth with mouthwash and a fluticasone minty breath rinse, especially before and after smoking. [substeps] The enamel on your teeth is compromised. Ending3: Use a whitening toothpaste if you would like to get an extra level of whitening action. [substeps] Smokers tend to have poorer oral health and a higher risk of periodontal disease, so it's important to focus on keeping your mouth healthy. Ending4: All of the other areas of your mouth should be brushed as well. [substeps] Be sure to brush at the corners and the crevices of your teeth and gums so that you can be even.

Answer format: ending1/ending2/ending3/ending4