Yes, ball stretchers and crushers can be safe when used responsibly. The key to safety is gradual adjustment, proper fit, and listening to your body. For stretchers, starting with a lighter, more flexible material is ideal before moving on to heavier metal stretchers. For crushers, pressure should be applied slowly and within a tolerable range, avoiding any extreme pain or numbness. If there is tingling, discoloration, or a loss of sensation, the device should be removed immediately. Regular check-ins and communication are essential, especially during BDSM play.