Some tooth infections cause severe pain, while others cause very little discomfort. Common signs include lingering sensitivity to hot or cold, pain when biting, swelling in the gums or face, a bad taste in your mouth, or a small pimple-like bump on the gums.
The only way to know for certain is with a dental exam and, in many cases, an X-ray.
If you notice swelling, fever, or difficulty swallowing, contact a dentist as soon as possible. These symptoms shouldn’t be ignored.