Hi, my 5yr old is biting his nails really badly so much so that they are frequently swelling with infection and needing lancing. We have tried stop-and-grow, but he just nibbles through it and don't know what else to do. If it was just nail biting, I wouldn't mind, but they get so painful and infected that he sobs when he washes his hands. Someone suggested rubbing a chilli on them as a stronger deterrent... would that be unreasonable?! He is very shy, but has lots of friends and is very happy so don't think there is a big psychological issue to deal with.