It's World Oral Health Day and a South African company has developed what is believed to be a world first, an alternative to the traditional toothpaste which we are all accustomed to, in a tablet format. This has a number of advantages especially for the visually impaired, as well as children and the elderly with poor hand coordination, and also great for the traveller. There is also no battle to squeeze out that last nurdle of toothpaste, nor empty tubes which cannot be recycled.  Lester Kiewit speaks to Dan van Zyl, founder and CEO of The Earthly Company.