Hi nickinoonoo, yes kittens do lose their teeth and they suffer from the same irritations in their gums as dogs and babies, hence the chewing. Once an animal begins a behaviour and gets some relief or pleasure from it, the animal is likely to continue the behaviour, even after the original prompt (ie teething) has ceased. Two of my cats (both eighteen months now) began cable-chewing as kittens. They destroyed three mobile phone chargers and two torch chargers. Thankfully, they only went for the very fine cables, and didn't interfere with the thicker cables from the electric fire or TV, so they didn't electrocute themselves.
My solution was to smear a little bit of mustard on the cables that the cats liked to chew. But be sure to use a very mild mustard - you don't want to burn the cat's mouth or tongue, which are very sensitive - you just want to give him a bad taste and smell every time he chews the cable. However, even after this, they may still go back to the cable to try again. So you need to keep a little mustard on the cable for a few weeks, just so the smell can remind puss how unpleasant it was to chew.
Best of luck