Please choose the correct ending to complete the given sentence: Health: [header] How to prevent mouth cancer [title] Maintain a good oral care regimen. [step] Maintaining a good oral care routine helps to reduce the risk of mouth cancer by preventing infections and other oral diseases. Brushing your teeth, flossing, and rinsing with mouthwash all contribute to an effective oral care routine.

Ending1: [substeps] Repeated and long-term gum disease, poor oral hygiene, and missing teeth can lead to infections that put your mouth under high risk of cancer. Make sure you don't have ill-fitting dentures or sharp, broken teeth that can cause repeated mouth irritation and increase your risk of mouth cancer. Ending2: If you're an athlete, make sure to support your legs and arms as you eat and drink. Eat plenty of protein such as chicken, fish, or milk, as well as whole grains. Ending3: Some of the actions your mouth will take on a daily basis should be observed by a qualified professional. [substeps] Be extra careful of cleaning your mouth with mouthwash products that might harbor bacteria. Ending4: [title] Use sunscreen when it's sunny outside. [step] Phototherapy increases the amount of vitamin c your body receives.

Answer format: ending1/ending2/ending3/ending4