Humans can grow numerous sets of teeth if scientists found the secret behind the cell's regeneration power in other living organisms like shark and pufferfish, says Dr Fraser, a biologist at Sheffield University.

Fraser identified the cells in these animals that are responsible for endless supply of teeth. He claims that if scientists discover similar, 'tooth fairy,' cells in humans and apply their regeneration mechanism in our body, it could lead to constant production of new teeth, when required.

'With our extended lives and modern diets, the limited supply of human teeth is really no longer fit for purpose. Our research is focused on looking for ways in which we can replicate the way that fish create an endless supply of teeth and bring this capability to humans.'

Fraser estimates that humans can possibly grow extra teeth after around 50 years.

'I guess people will be looking at whether you can make perfect teeth,' Fraser said. 'But there will always be orthodontists employed because even when you have new teeth, there is going to be a need for positioning.'

Fraser is intrigued as to why humans have only two sets of teeth while other living organisms produce numerous ones. For example, a shark grows new teeth once a fortnight.

'It could be possible for humans to evolve to grow beaks, like pufferfish, which may be more robust and practical,' Fraser said.

Fraser said that beaks can prove beneficial for humans as it would not rot, chip or fall out. He predicted that a facial change might occur after a millions of year when the teeth would combine together to form a tough, pointy beak.