Remember when McDonald’s lost a lawsuit over a customer accidentally scalding herself with too-hot coffee? The temperature of that spilled coffee was between 180 to 190 degreesFahrenheit, causing third-degree burns that required skin grafts for the customer’s inner thighs. Besides a burnt tongue or lap, there’s another reason why very hot drinks might be harmful to your health.
http://www.alternet.org/food/warning-very-hot-drinks-may-cause-cancer
Warning: Very Hot Drinks May Cause Cancer