How long does numbness last for baby teething gel?

Do not use: The fda has advised against the use of benzocaine-containing teething gels in children under the age of two. Although very rare, the Benzocaine gel has been associated with cases of methemoglobinemia which is potentially a life-threatening deprivation of oxygen.

20 minutes tops: I feel the need to warm you about teething gels. In my experience they are not very effective and the anesthetics in them are rapidly absorbed form the gut.The levels are relative to their weight and they just isn't much room for error.With little babies and small children it is easy to get into a dangerous amount of anesthetic. There isn't much room for error. Use cold, Ibuprofen and try camilia.

Agree: Further, not only is the numbness short lasting, but when it wears off the pain often is worse than it was to begin with. That is called rebound pain. I recommend never using the stuff, ever.