Step 4. Plant the star fruit tree in the hole so that the top of its root ball sits at least 2 inches above the ground (you may have to fill in more soil/compost mixture to get it to the right height). Fill the hole with the soil/compost mixture and tamp the soil down firmly with your feet to remove any air pockets.
The toothbrush consists of a plastic handle and nylon bristles attached to the head of the brush. Contemporary designs offer a variety of styles and shapes in a market that has swelled to $600 million in the mid-1990s, in part because of price increases, but also because toothbrushes are replaced frequently.
Other designs in Europe used feathers. The first toothbrush of a more modern design was made by William Addis in England around 1780 â the handle was carved from cattle bone and the brush portion was still made from swine bristles. In 1844, the first 3-row bristle brush was designed. Natural bristles were the only source of bristles until Du Pont invented nylon. The invention of nylon started the development of the truly modern toothbrush in 1938, and by the 1950s softer nylon bristles were being made, as people preferred these. The first electric toothbrush was made in 1939 and the first electric toothbrush in the US was the Broxodent in 1960. Today, both manual and electric toothbrushes come in many shapes and sizes and are typically made of plastic molded handles and nylon bristles.