We've used this teething gel a few times. It's only effective to numb the gums for a few minutes, enough to get baby to sleep in the evening if the teething pain is the only reason keeping it awake.

Benzocaine is not very safe, and my main concern was that if the baby swallows it it may numb the throat. So we only use a very very tiny amount on the tip of the finger and then rub. I'm surprised there aren't more warnings on the label of it.

So, it works well, for short amounts of time.