[header] How to know if you have an infected tooth [title] Monitor any toothache that you feel. [step] An infected tooth can cause mild to severe pain in that area, depending on how infected the tooth is. The pain is generally continuous and sharp. 
Some dentists describe it as a shooting, throbbing, or gnawing type of pain. This pain will radiate upwards and downwards along the side of your face to places like your ear, jaw or head.