Ds has went through stages of little habits since he was 3.5 - 4 until now hes 6 (nearer 7 now). It started with licking skin around mouth, then rolling his eyes, he has stopped those now but now he makes a clearing throat sound and occasionally stretches his mouth really wide but the worst thing is he picks his nails and its all the time and a horrible sound, hes picked them right down low and picks the surace of the nail off, i have no idea why hes doing this and he gets annoyed when i tell him to stop but hes going to end up hurting himself any ideas how to stop this? he hates getting a raggy bit and gets upset but it dosnt seem to deter him at all