I have dry skin and very dry lips. I use lip balms every day, but my lips are still chapped and painful, especially corners. Even brushing my teeth is very painful. What can I do to prevent? Are there any special products beside lip balms to use? Thanks for your answer in advance.

I buy always 50+ factors.

I think it depends on your skin type how often you should apply sun cream. I use it only on beach holidays but I reapply every 2 hours. My skin does not burn easily so I am ok with it.