You would think just drink something cold like chilled water. That is exactly what most people do when their eyes are watering with a fire in their mouth. The result is the opposite. Seconds after sipping the chilled drinks, the fire starts right back in. Then more water gulped down but the heat never goes away. Your stomach stuffs up with water after a while.
What is the correct way to deal with this. Well Thai dishes are always served with rice. So, the trick is don’t enjoy each dish separately. A soothing mouthful of rice once after every a few spoons of dishes will not only enhance the taste of the spicy Thai cuisine but also prevent your tongue from getting bombarded by chillies and other spices. But if you happen to accumulate unbearable heat on your tongue, take some candy or something sweet even a sugar cube. Leave it in your mouth as long as possible. And, remember, no water!
A friend of mine told me the other day that chewing banana will help remove the sting of heat from your tongue inferno too. You can find banana everywhere all year round in Thailand, so this may be a more natural cure.