State licensing requirements for applying lash extensions vary from state to state, so you must research the need for your country and comply with any laws and conditions concerning using any lash extension products. Please be advised that since lash extensions are still relatively new to the U.S., you may not find a specific reference to "lash extensions" or "eyelash extensions" written in the codes. However, some states may provide a definition that would include lash extensions, such as "applying eyelashes to any person." Some states do not require a cosmetologist or anesthetic license.