Lidocaine is only for the immediate pain.

Here is what the article says about lidocaine:

"benzocaine may be safer than other anesthetics, such as lidocaine, which can cause side effects, such as blurry vision and dizziness, says Michael Oszko, Pharm.D., an associate professor at the University of Kansas. "

We have not experienced any blurry vision or dizziness. It sure does work better!