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Sensitive teeth are abnormally reactive to hot, cold or sweet foods. You have dental sensitivity if something like an ice-cream or frozen yoghurt that did not cause any discomfort before, now causes a sudden, sharp sensation in your teeth. 
What is tooth sensitivity? 
If there is sensitivity in only one or two teeth, it is most likely because of cavities . Tooth sensitivity in more than a few teeth is caused when the outer protective enamel of the tooth is worn away, exposing the inner sensitive layers of the tooth. This wearing off can happen with age, stress, faulty toothbrushing, acidic diets, crooked teeth and improper oral hygiene habits. 
Why am I having sensitive teeth? 
A cavity will require a filling . Deep cavities that have caused infection in the roots will need root canal treatment (RCT) . For dental sensitivity due to loss of enamel, there are different ways of handling it. You may start by using one of the sensitivity toothpastes available commercially, or see your dentist who will coat the exposed layers with a protective varnish. But more importantly, you must see your dentist to know the cause of your sensitivity and prevent further damage to the teeth. 
What is the solution? 

Frequently Asked Questions (FAQ's)

  1. How can I prevent dental sensitivity? - Use a soft to medium brush with the proper brushing technique (avoid horizontal brushing strokes). Use a fluoridated toothpaste and visit your dentist regularly to  monitor early signs of enamel loss. 
  2. I brush thrice daily. Why are my teeth still sensitive? - Overzealous brushing will only wear off the protective enamel in the tooth and cause more sensitivity. Brush twice daily using the recommended toothpaste, toothbrush and brushing technique. 
  3. Can I use a sensitivity toothpaste always to prevent sensitivity? - It depends on what your sensitivity toothpaste contains. A toothpaste that contains fluoride is safe and recommended for daily use. A toothpaste containing other chemicals like potassium nitrate are best used for 2-4 weeks on the advice of a dentist.