Not at all! Eyelash extensions are not harmful if applied safely and correctly. The Lady Code applies a single extension onto a single one of your natural lashes one by one. We use a specially designed bonding agent exclusively designed for eyelash extension which gives flexibility and comfort to your eyelashes. As long as you do not pull or rub your eyelash extensions, you do not have to worry. If you are feeling any discomfort, call The Lady Code immediately.