If you experience pain in the upper and lower incisor it may indicate pyelonephritis (kidney infections), cystitis (inflammation of the bladder) or otitis (a middle ear infection).
Pain in the first incisor may indicate prostatitis (swelling and inflammation of the prostate gland) or tonsillitis.
Chronic pain in the canine teeth may indicate that you are suffering from hepatitis or cholecystitis (inflammation of the gallbladder).
Pain in the premolar teeth can be a sign of allergic reaction, dysbactriosis (microbial imbalance), pneumonia or colitis (inflammation of the inner lining of the colon).
Pain in the fourth teeth (top and bottom) may indicate pain in the elbows, colon disease, shoulder pain, knee pain or an inflammatory-related diseases like arthritis.
Pain in the molars means it's very likely that you are suffering from anemia, gastric ulcer, chronic gastritis, duodenal ulcer, or chronic pancreatitis.
Pain in the sixth lower teeth is a sign of atheroclerosis (a disease in which plaque builds in the arteries), vein-related problems and problems associated with the arteries.
Pain in the sixth upper teeth is linked to inflammation of the ovaries, thyroid gland and spleen, sinusitis and pharynx diseases.
The wisdom teeth are associated with cardiac diseases, congenital defect and coronary heart disease.
Pain in the lower molars indicate varicose veins, polyps in the colon or lung related problems like bronchitis, pneumonia, asthma and bronchial.
So next time you have a toothache, check to see whether the problem lies internally.