Having sensitive teeth is very common but it can be incredibly annoying and sometimes painful. The good news, however, is that this can be easily treated with some simple self-dental-care!
Speak with your dentist

The first step is to see your dentist so that you can discuss your symptoms. Your dentist may be able to seal the area of sensitivity with a bonding agent and may prescribe you some fluoride gel to rub onto your sensitive gums and teeth after you brush. This can help to cure the pain, over a period of time.
Switch to a soft-bristle toothbrush
Using an ultra soft toothbrush is also a good idea and these are widely available in pharmacies or at your dentist. When brushing, try and avoid brushing your teeth horizontally as this could expose the roots, worsening the problem. Speak to your dentist about the correct toothpaste to use. He or she may prescribe you some special toothpaste for sensitive teeth. Otherwise, browse your pharmacy for a good brand of toothpaste for sensitive teeth.
Foods to avoid:
By now, you probably know what causes pain from sensitive teeth, so try and avoid these triggers (e.g. ice cream or very hot drinks). Carbonated drinks, citrus fruit, and wine can all exacerbate your sensitive teeth and if you cannot avoid these foods and drinks, ensure that you always brush or chew sugar-free gum afterward. Chewing some sugar-free gum or brushing your teeth after eating acidic or sweet foods will further help you along in combatting sensitive teeth.
Salt-water rinse
Rinsing your mouth twice daily with a saltwater solution can also work wonders for this condition, so try it!
Having sensitive teeth need not be a lifelong condition if you follow the above-mentioned pointers! To avoid a recurrence, brush those a day with an ultra-soft brush, be sure to floss and be gentle on your teeth during the brushing process!