Tránh yếu tố kích thích lở miệng. Phát hiện lở miệng trước khi bệnh xuất hiện. Ngăn chặn lở miệng phát triển. Bảo vệ môi khỏi ánh nắng. Giữ sức khỏe.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
There are a variety of things that can cause cold sores and it's a good idea to be extra vigilant if you are susceptible to them. Even stress and lack of sleep can cause cold sores, so try to get a good night's sleep.  If you come down with a cold, fever or flu, your risk of an outbreak may increase because your immune system is compromised. Make sure you're getting all your necessary vitamins and eating healthfully. Menses, pregnancy, hormonal changes, and even sunlight can cause a cold sore to