If your teeth are sensitive to cold or hot drinks, spicy foods, or things that are particularly acidic, then that is probably an indicator of something worse going on inside your mouth.
Highly sensitive teeth can be indicators of everything from tooth decay and gum disease to exposed roots and worn fillings. A tooth could even be cracked, which can be extremely dangerous.
Of course, make sure you follow routine maintenance like brushing and flossing, but you also want to see a dentist regularly, especially if the pain persists over an extended time. They will want to make a visual examination, and possibly even take x-rays. Don’t worry. Figuring out the problem is the first step to solving your tooth pain.
Treatments may be quite simple, like a good cleaning or a fluoride treatment. There could also be simple fillings or even extractions for some cases, but once it is done that pain will be gone.