Eyelash extensions are not inherently dangerous, but some risks should be considered.
Allergic reactions
There is potential for an allergic reaction to the glue, lash material, or other chemicals used during the application of eyelash extensions. Eyelash extensions and glue are not currently regulated by the U.S. Food and Drug Administration (FDA).
Infections
If the aesthetician or the salon doesn’t follow proper sanitary procedures, there is a risk of an eye infection. Infections can also occur if the user doesn’t properly clean the extensions during wear.
Eyelash damage
Pulling, tugging, or chemical reactions can damage the underlying natural lashes. Sometimes, the lash loss is temporary, and other times, eyelash extensions can cause permanent damage to the hair follicle.