In 1996 US FDA approved acupuncture needles for licensed practitioners. FDA requires that the needles be sterile, nontoxic, and disposed of after a single use.
We only use FDA approved sterile, disposable needles. They are only used once. These needles are carefully manufactured under the guidance of FDA. There is no risk of infection.
Acupuncture needles are small and hair-thin. They are solid. (not hollow like the needles used by doctors in surgery.) The end of an acupuncture needle is smooth and rounded. Acupuncture needles are not designed to cut the skin. Instead, when an acupuncture needle is inserted, the round edge pushes the tissue aside without cutting it. Acupuncture needles are so thin it's as if they can glide through the spaces between the individual cells of the body.