Why is my tooth sometimes sensitive after a filling is placed or work is done on it?
This is a normal response that can occur after any type of treatment is performed on a tooth. We call it a hyperemic response. It is basically when the inside of the live tooth, which we call the pulp, gets temporarily inflamed as there is an increase of blood flow or pressure in this area that causes an exaggerated response to cold, hot, or even biting pressure at times. In this state it is considered reversible and with time will go back to normal, usually within 2 to 3 weeks. If it does not go back to normal and gets worse then, sometimes it can go to an irreversible state and need further treatment such as a root canal or endodontic therapy. Thankfully, this does not happen very often.
Why does this occur?
With deeper decay or breaks in the tooth, it is more common. The pulp, which has blood vessels, and the nerve inside has only one way in and out, through the end of the root. There is no collateral circulation like other parts of our body. So, when the tooth becomes inflamed the pressure builds up inside the tooth, it amplifies the response to stimuli such as temperature and sometimes pressure. The key here is to just baby the tooth and avoid things that make it sensitive and let it calm down by itself. Sometimes we recommend a desensitizing toothpaste to help it get back to normal quicker. It is important that if it persists or gets really intense to contact the dentist for further evaluation. Most times the tooth will go back to normal without any further issues within weeks. It is usually a temporary normal and reversible response, and no further treatment is needed.
Below is a photo of a tooth that had a restoration placed that temporarily had this issue for about two weeks:
(The information contained in this article is strictly for educational purposes and is not meant to replace the professional knowledge or advice of your personal dentist.)
