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.
The next time you're told to step up to the sink and scrub up, remember these handy hints: Use warm water (not cold or hot) when you wash your hands. Use whatever soap you like. Work up some lather on both sides of your hands, your wrists, and between your fingers. Rinse and dry well with a clean towel.