Acupuncture needles, in general, do not expire. These acupuncture needles are passed down by generations and sterilized with fire and alcohol. Nowadays, one can only use an acupuncture needle on a patient for ten prickings before being discarded. However, it all depends on the patient's skin's resilience. If sharpness persists, you can use it ten times, although five times would be preferable. You can discard the needle once it gets dull.