Canker sore: A canker sore, also known as an aphthous ulcer, is a single pale or yellow ulcer with a red outer ring or a cluster of such ulcers in the mouth, usually on the cheeks, tongue, or inside the lip.
The Board will allow a maximum temperature of 120 degrees Fahrenheit. Hand sinks in commercial kitchens are only used by employees. These employees are typically washing and rinsing pots and pans in pot sinks which could have 140 degree water. Those pot sinks, in some kitchens are located right next to the hand sinks.
Updated 11/25/14. Water temperature when washing dishes should be very hot. Try to get the water hot enough so that it is uncomfortable for your bare hands to be submerged for very long. Your hands probably can't tolerate water over 110-115 degrees. To help you use the hottest water possible,try wearing dishwashing gloves.