The Food and Drug Administration is warning parents about the use of over counter anesthetics containing benzocaine, especially in children younger than two.
The FDA said benzocaine, found in some teething gels, can lead to methemoglobinemia.
Methemoglobinemia is a disorder that reduces the amount of oxygen in the blood stream, leading to serious side effects such as shortness of breath, fatigue, and blue-colored lips and nails and even cause death.
The gels are still safe to use, but only sparingly.
It is especially important to follow the directions and not give too much to your child.