In most cases, teeth are sensitive because their protective outer layers—enamel over the crown, or cementum over the root—have worn away. That exposes your tooth's dentin, which is full of tiny tubes with sensitive nerve endings running through them.

 According to the American Dental Association (ADA), tooth sensitivity is usually triggered when eating hot or cold foods, and can be caused by:

  • periodontal (gum) disease
  • tooth decay and exposure of roots at the gumline
  • aggressive toothbrushing
  • wearing away of the enamel, the hard surface that protects the nerves of each tooth

     Try these tips for healthier, pain-free teeth:

    Swap Your Toothbrush

    Brushing can help keep your teeth healthy, but using a hard-bristled toothbrush or a highly abrasive toothpaste can aggravate sensitive teeth. Instead, swap out your usual toothbrush for a softer product, and brush your teeth gently.

    Avoid Acidic Foods

    Certain foods, such as carbonated drinks, coffee, citrus fruits and even yogurt, can cause sensitivity. This is because acidic products can actually to the wear away of tooth enamel. Consider avoiding them altogether, and if you must have your daily soda, do so by drinking through a straw to limit the contact the liquid has with your teeth. Additionally, don't brush your teeth right after eating or drinking acidic foods; acid softens your enamel and makes your teeth even more sensitive if brushed against too quickly. Instead, have a glass of milk to help neutralize the acid.

    Wear a Mouth Guard

    Do you grind your teeth at night? If you suffer with sensitive teeth, you might, even if you don't realize it. Teeth grinding can wear away tooth enamel so they feel sore and sensitive the next day. A mouth guard can help keep you from grinding: You can get one from your dentist or find it in the oral care section of your drug store. This item acts as a protective bite piece that is placed on your teeth to protect the enamel, similar to those worn by athletes in contact sports

    Tooth Paste for Sensitive teeth

    Lots of tooth pastes are available in the market. But just brushing with them doesn't help.You need to apply the paste on your sensitive areas and wait for a minute, let the paste act and then brush it off.

    Home Remedies

    Clove Oil can help to a certain extent to relieve pain.