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It's the question every first-timer asks. The honest answer: yes — when they're applied properly by a trained artist. Here's what actually matters.
Not when they're done correctly. A single extension is applied to a single natural lash, at a weight your lash can support. Damage usually comes from the opposite: lashes that are too heavy, poor isolation, or clients picking and pulling them off. Choose skill, and your natural lashes stay healthy.
Professional lash adhesives are designed to bond away from the skin and eye. If you have sensitive eyes or a history of reactions, tell your artist — a patch test can be done first. Your eyes stay closed and protected throughout.
With correctly applied extensions, your natural lash cycle continues normally — there's no need to "rest" your lashes. What helps most is gentle care and proper removal instead of pulling.