nail caps

My sphynx, about 6 years old, healthy, no skin issues that I'm aware of (no visible rashes) has been scratching himself behind the head an unusual amount lately. I keep his nails trimmed but he still is getting all scraped up from it. I haven't changed his shampoo (Johnson's baby shampoo) or...

Hi! I have just ordered SoftPaws. I'm really looking forward to trying them out. But I was just wondering if anyone has noticed any downsides to them? Can they still use their nails properly? As in, are they still able to grip onto stuff the way they should? :p