The key to preventing tooth sensitivity is to keep your gums healthy

The key to preventing tooth sensitivity is to keep your gums healthy by reducing the pressure you use while brushing, use a soft toothbrush and to maintain good oral health habits. This means brushing all your teeth for 2-3 minutes, not the usually 30- 45 seconds that most people brush. Flossing is crucial in order to reach the 35% of the tooth surfaces where brushing can not reach.
 

Prevent tooth sensitivity by
Maintaining a good oral hygiene by using a proper brushing technique and flossing.
Using a toothbrush with soft or ultra-soft bristles.
Reducing the consumption of acidic foods.
Avoiding grinding the teeth, by wearing a bite splint when needed.
Going to the dentist for regular dental exams.
 

Treatments
Non-acidic mouthwashes containing fluoride.
Fillings to cover worn away enamel or the receded root.
More severe symptoms or a persistent sensitivity can necessitate other treatments.