The answer to this question is a definite - yes! This is an excellent time to contact you dentist for a checkup. Even if your sensitivity goes away quickly and on its own, a sensitive tooth should not be ignored because it's trying to tell you something.
When your tooth begins to feel that twinge when you have hot or cold foods or beverages, it's an indicator that decay may be affecting it. The decay can typically be removed and then your tooth repaired with a dental filling at this point.
Decay that is left untreated will progress, and could end up affecting the nerve, or root, of your tooth. This is when you will start to feel severe pain because your tooth has become infected. It's also important to understand that a dental infection won't go away on its own. You will need to contact your dentist right away in order to relieve your pain and remove the infection from your tooth. This is typically done with root canal therapy.
By contacting your dentist when you first feel sensitivity, you may be able to avoid more invasive and costly treatment procedures like a root canal.