Dr. Sandesh J. Mehta

Mild to severe tooth pain can turn out to be debilitating and damaging condition if it is persistent. Also, the pain can spread to the rest of the head and give you an uncomfortable ache and tingling sensation all day long. So what are the causes behind tooth pain? Here's our list!

1. Tooth Decay: The presence of food debris that has not been cleaned out can stay on and cause cavities and persistent tooth pain. This condition can also make the teeth extra sensitive and pain then emanates as a natural response to signify that all is not well in the area. This can also lead to sharp pain when bite an apple or munch on nuts. One must see a dentist for this kind of pain so that scaling and plaque removal can take place. 
2. Injury: If there is persistent, throbbing pain after eating something that is too hot or too cold, then it might be more than mere tooth sensitivity. This condition could also point at chipped, broken or cracked teeth due to excessive teeth grinding or a fall or accident. It could also be caused due to sports injury. The dentist will usually take a dental X ray to find the cause of the pain and to unravel the extent of the damage as well.
3. Inflammation: Constant pain may also point at inflammation of the pulp. This may be caused due to damaged roots. If this kind of inflammation comes with bleeding and fever, then you must see a dentist immediately. It can also mean that the pulp or root of the tooth is dying, in which case a root canal may be required. 
4. Sinus: A dull ache in the sinus area of the upper teeth usually point at sinusitis, which is a condition that emanates due to pain in the nerves of that area. This pain can also happen due to cold and cough as well as an allergic attack that affect the facial muscles due to excessive sneezing and watering of the eyes. Also, a flu and fever can lead to this kind of pain. 
5. Infection: Inflammation along with fever and bleeding can also point at infection. This can render the complete pulp tissue damaged. Also, the growth of abscess in such cases can cause acute tooth pain. The dentist will usually diagnose the issue with a tooth X ray before prescribing antibiotics and carrying out a root canal for severe cases. 

Persistent toothache with other symptoms should always be checked by a dentist so as to rule out long term damage that can result in tooth loss. If you wish to discuss about any specific problem, you can consult a general physician.