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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 everything before putting it in your mouth. Touch it with just the tip of your tongue to make sure it is a safe temperature. Foods like crackers, chips, and crunchy bread should be off the menu until your burn heals. These can scratch against your burn, which will be very painful. They can also pop blisters, which will slow the healing process and put you at increased risk of an infection. Spicy food will cause a lot of pain for your healing mouth. The irritation from spices can also slow the healing process. If you're a fan of spicy food, it would be best to abstain for a few days while your burn heals. Also avoid adding any spices like pepper to your food. These are mostly citrus-fruits like lemons, oranges, and pineapples. Citric acid will hurt and slow the healing process. Wait at least 3 days before bringing these foods back into your diet.
Avoid hot food and drinks while your mouth is healing. Avoid crunchy food. Abstain from spices. Stop eating acidic food.