Back in the 1970s and 80s, it was said that the busiest people in the rugby league world were the craftsmen who made dentures.
A pretty rough world it was, with almost weekly episodes of dental realignment during club football at Carlaw Park.
At the time, mouthguards weren't fashionable and coat hanger tackles (quaintly called "clotheslines" in a report on the Hamilton rugby test last weekend) were regarded as just another hazard in advancing the football from goal line to goal line on any given Saturday.
Yet, in a curious demonstration of the law of cause and effect, there appeared to be a bizarre benefit from the game's relatively open minded attitude to head high tackling. It became evident that many of rugby league's hard men had early on lost the dental armoury to practise the low act of biting on the football field.
Like it or not (and most Carlaw Park patrons did), brawls were common and, in those days, part of the entertainment. But looking back, rugby league was energetically self-policing about biting and kicking. They were the no-go areas of a sometimes brutal, sometimes beautiful game.