Hoping for bit of inspiration here[msnsmile]

I have 2 children who are nailbiters , who seem to be immune to all the 'Stop and Grow' type products in the UK.

Does anyone know of anything available in the US that might break the habit? The children are 11 and 8 - no sign of growing out of it - they'll be down to their elbows soon!

The stronger the better[}]