These stimuli transmit signals directly to the pulp, this way you’ll feel the pain. This sensation vanishes as soon as the stimulus is removed. Also unlike a toothache, the pulp of a sensitive tooth usually is not infected or inflamed. Most tooth sensitivity will disappear with time. The teeth are very sensitive at first, but after a tine ( a month or so ) the pulp will react by laying down some hard tissue from inside the tooth .

Try to use toothpaste designed for sensitive tooth. Keeping the tooth clean with no plague with a fluoride toothpaste will stimulate the tooth to fill in tubules.

Brush up and down. Wrong brushing will cause hypersensitivity. Be careful near the gum, that’s where the most sensitivity occurs .

Use a soft brush, which are less likely to irritate sensitive teeth and will not expose underlying tubules.

Don't use a tartar control toothpaste, use a fluoridated toothpaste or desensitizing toothpaste

Try to avoid extremes hot or cold. Try to serve hot or cold foods at close temperatures to the room and avoid biting into foods of different temperatures extremes at the same sitting.

Avoid salt water, in case of hypersensitivity it will cause a movement of fluids within the tubules which will stimulate more pain

Avoid eating too much acid foods or sweets. Foods with high acid content can eat away your tooth enamel. Eating sweets will enhance the pain.

If you are at risk for erosive tooth wear you should avoid brushing your teeth for at least 60 minutes after consuming erosive food or drink such as fruits, salads and sports drinks.

Instead of brushing right after eating erosive foods try:

Rinsing with water

Rinsing with a fluoride solution

Chewing sugarless gum.

And always remember to brush with a soft bristled toothbrush.