Tránh thức ăn và đồ uống nóng trong khi miệng bạn đang lành. Tránh thức ăn giòn. Kiêng đồ ăn có gia vị. Ngưng ăn thức ăn có tính axit.

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?
You can still have your coffee and tea, but just make sure you allow it to cool fully before drinking. You might even want to consider switching to iced varieties for a few days. The new cells in your mouth will be very sensitive- if you expose them to hot food before the burn is fully healed, they can easily burn again. Also it will be very painful.  Blow on food and drinks to cool them off faster. For drinks, you should consider adding an ice cube to ensure they are a safe temperature. Test ev