Why does milk help with spicy food but water does not?

Capsaicin is fat-soluble and does not dissolve in water, so water pushes it around the mouth and onto tissue that has not been exposed yet. Casein, the main protein in dairy, surrounds the capsaicin molecule and lifts it off the TRPV1 receptor. Whole milk beats skimmed, and yoghurt or ice cream beat both.

Does sugar help with a chili burn?

Yes. A spoonful of sugar held in the mouth measurably reduces reported burn. The mechanism is not fully settled — partly physical displacement, partly competing sensory input — but the effect is consistent enough to rely on, and a sweet drink is the reason mango lassi is served with hot curry.

How long does a chili burn last?

At jalapeño level, roughly three to five minutes. At habanero level, ten to fifteen. Superhots build for several minutes before they peak and can take half an hour to fade. A burn still climbing after twenty minutes usually means capsaicin is still present rather than that anything is wrong.

What should you do if chili gets in your eye?

Do not rub, and do not flush with water alone — capsaicin does not dissolve in it. Rinse with whole milk if you have it, or use a small amount of oil or dairy on the surrounding skin first, then flush thoroughly. Wash your hands with dish soap and oil before touching anything else; the oil on your fingers can last for hours.

How to Stop a Chili Burn: What Works, What Makes It Worse

Almost everything true about relieving a chili burn follows from one property: capsaicin is fat-soluble. It dissolves in fat, oil and alcohol, and it does not dissolve in water. Every remedy that works is one that gets fat or protein between the molecule and the receptor. Every remedy that makes things worse is one that moves the molecule somewhere new.

What works

Dairy, and whole-fat dairy first

Casein — the dominant protein in milk — acts as a detergent on capsaicin, surrounding the molecule and stripping it off the nerve ending. This is not a folk remedy that happens to be true; it is the mechanism. Rank them by fat and protein together: ice cream and full-fat yoghurt, then whole milk, then skimmed. Sour cream and lassi work for the same reason. A non-dairy milk without casein is close to useless, which is worth knowing before you rely on it.

Hold it in your mouth rather than swallowing straight away. The contact time is what does the work.

Sugar

A spoonful of sugar, or a genuinely sweet drink, measurably lowers reported burn. Part of it is physical, part of it is that a strong competing input crowds out the signal. It is the cheapest thing in the kitchen and it is reliable.

Starch

Rice, bread, potato and tortilla physically carry capsaicin off the tongue. This is why every cuisine that cooks hot food serves it over something bland — the starch is not a mercy, it is part of the dish.

Acid, in small amounts

Lime and vinegar help somewhat. The effect is smaller than dairy's, and a sharp acid on already irritated tissue is not comfortable for everyone.

What makes it worse

Water. It does not dissolve capsaicin, so all it does is spread the oil across tissue that was not previously exposed. A large cold drink of water is briefly soothing because of the cold, and then noticeably worse.

Beer. Alcohol dissolves capsaicin, but beer is around 5% alcohol and 95% water, so it behaves like the water. Spirits work better in principle and are a poor idea in practice on a mouth that is already inflamed.

Rubbing your eyes, and everything else you touch. The oil stays on your fingers for hours and survives a casual rinse. Wash with dish soap, which is designed to lift oil, and use gloves when handling anything above Habanero level.

How long it should last

Burn duration scales with the level, and it is not linear. A jalapeño at 5,000 SHU fades in three to five minutes. A Habanero at 225,000 runs ten to fifteen. A ghost pepper is stranger than either — the onset is delayed, sometimes by thirty seconds, which is how people talk themselves into a second bite they regret, and the peak can arrive several minutes in.

The practical rule when training: have the dairy in your hand before the first bite, not after. Standing up to look for it is how a manageable session becomes a bad one.

The one thing that helps most

Not being surprised. Most of what makes a burn unbearable is the part of it you did not expect — not knowing when it will peak, or whether it is still climbing. Knowing the shape of the curve at a given level turns the same physical sensation into something you can sit through, which is the reason experienced eaters look calm at heats that would floor someone new to it.