HO HO HO !!! No - they are all very good thankfully. Mine have popped out at the back so have given me some really good big teeth.
This is a little one - bottom - just before the biggies start.
Mate My L5,L4 and sciatica is screwedI sometimes get a lower back issue. My physio gave me these 3 or 4 set exercise which I do if it occurs. They work VERY well.