pain threshold level. Older patients don't feel the pain as much because
the nerve in the tooth is far away from the surface of the tooth, and
therefore, you should not feel the pain as much. If your cavity extends to
the first part of dentin only, then you will only feel sensitivity when
your dentist is drilling your decay. But if extends beyond that, then local
anesthesia is recommended. Last, if you have a high pain threshold (the
point at which pain begins to be felt), then you should not feel the pain
as much. Hope that helps!