| | Cancer | Oral Cancer What is the temperature of a mouth? Normal oral temperature (sublingual), measured with an oral thermometer, ranges from 35.4–37.4 °C (95.9–99.4 °F). Oral Cancer - Related Articles How to Live With Mouth Cancer What Is Reverse Smoking? Why do girls have big lips? What is a salivary gland tumor? What are causes of metal taste in mouth? What is plaque in the mouth? Does alcohol consumption and smoking increase your risk of oral cancer?