Fine needle, also called slimming needle, will do some harm to the body. If patients inject occasionally in a short time, the harm to the body will be very small. If they inject a lot for a long time, it will damage the body organs. If they take slimming needles for a long time, it will make the body dependent. If you stop using it, it will sometimes have side effects, which will cause muscle atrophy and affect normal activities. So fine needles are not safe.