There are many things that can cause an orange-coated tongue, including vitamin deficiencies, according to WebMD. Scarlet fever can also cause this problem.
A lack of vitamin B or folic acid can cause a tongue to take on a reddish or orange color. Geographic tongue is another condition that can cause the tongue to turn colors. Geographic tongue is a benign condition that causes the tongue to turn colors. It usually does not cause any other symptoms. To determine the true cause of a orange coated tongue, a person should seek the help of a physician or dentist. These professionals can properly diagnose and advise the right treatment.