Teeth don't grow back once humans become adults: any wear and tear is permanent - as those with fillings would know - which is why it's essential to keep them as clean and healthy as possible.
However, this is something scientists are now looking to change. It's been announced that clinical trials for a potential tooth regrowth treatment are set to begin in July 2024, building on decades of research in the field. If those trials are successful, therapeutic drugs could be available by 2030.