After a composite filling is placed, the filling is cured or set by a fluorescent light in the office. The filling will be fully functional when you leave the office. You do want to be careful since the area may be numb. It is not uncommon for some minor sensitivity to occur after a restoration is placed, especially to cold. This is normally a sign that the nerve is inflamed and will typically improve on its own with time. If pain is severe or lasts more than a few days you should return to the office for evaluation.
Call our office at (610) 929-4252 with any questions.