Safety is vital in BDSM because many of the activities you could do might cause significant injuries in extreme circumstances. Nipple play is no different. As long as you use the nipple toys correctly, you’re on the safe side. Although they restrict the flow of blood to the nipple, they do not stop it completely and at most will just induce a mild tingling sensation once the nipple clamps are already released. This is why it’s strongly advised that you disconnect the nipple clamps regularly with prolonged use. Place them on but consider removing them once they feel physically unpleasant, or after about 15 minutes of use.