Answer to your problem lies in your question only. regularly taking very spicy food leads to such a problem. the smell is the result of dryness which is due to injury
to the salivary glands which don't produce enough saliva to flush the food remnants left in the oral cavity.
All you need to do is to lower the spice in your daily diet, drink as much as water as possible and apply kenacort
ointment before every major meal for a week.
the burning sensation will go in 3 to 4 days.