“How long does tooth sensitivity last?”

Forever until treated.

It depends on the cause of the sensitivity. If it is due to recession and exposed root surfaces, or due the the enamel (outer white layer of tooth) becoming soft or starting to break down due to poor hygiene, then the sensitivity will last until the gum disease or hygiene/cavities are addressed. If you whitened your teeth recently, it could last 1-3 weeks, and using "Sensitivity toothpaste" that has fluoride or potassium nitrate in it will help alleviate that.

Dr. James Oliver

Teeth sensitivity problem is prevalent among the all age group of people worldwide. And when your tooth becomes sensitive you feel a kind of sensation in your teeth especially at the time of eating cold food items or consuming icy drinks.

Though, owing to age factor you naturally feel some kind of sensation in your teeth if you eat ice-cream or drink excessively cold fluids.

Reasons for Sensitive Teeth

However, when your teeth are healthy, underlying layer of dentin is protected by enamel and tooth roots are protected by gums. But when your gum line started receded and the enamel is worn down, than dentin is exposed into your mouth.

The dentist will diagnosis with an x-ray report to examine if root canal treatment is the problem or something else or there is room to perform the root canal treatment Jamaica.

Not all sensitivities are the same. If it is due to tooth decay, it will not go away. If it is caused by gum recessions, it can be treated with toothpastes like sensodyn.
If I were you, I would start with using sensitive tooth pastes like sensodyne, give it couple of weeks to work and see where you are .