Please choose the correct ending to complete the given sentence: Health: [header] How to avoid lip chapping during winter [title] Moisturize your lips. [step] Applying lip moisturizer often is the best defense against lip chapping. Keep a tube of lip balm in your pocket and apply it to your lips at least once per hour.

Ending1: [substeps] Look at the products on lip chapping bags to find out the most needed amounts. Make sure that the lip balm does not contain long-lasting petroleum, such as vaseline or petroleum jelly, which can cause stains or discoloration when used. Ending2: [substeps] Choose lip balms with an spf 15 rating or higher if you will be outside. Uv rays can be damaging to your lips and make chapped lips worse. Ending3: [substeps] If your lips swell during cold, you may want to moisturize them with lip balm or other lightweight products that contain spf. These products work by shutting down the dna bonds in the skin causing chapping. Ending4: [title] Moisturize to keep your lips moisturized. [step] To help protect against chapped lips, keep your lips moisturized and prevent lips from getting chapped or sore during the winter.

Answer format: ending1/ending2/ending3/ending4