How do X-rays detect tooth decay?
X-rays are particles of ionizing radiation projected from an X-ray machine. These particles are sent at various energy levels, in the form of an X-ray beam. Only the higher energy levels have sufficient penetrating power to pass through human tissue, expose the X-ray film and produce a black and white X-ray picture. The more particles reaching the film, the blacker the picture. Dense tissue, such as teeth and bone, absorb most of the particles and only a few of the very high energy particles reach the film, producing a lighter image. Less dense tissue, such as skin and muscle, allow more particles to pass through and reach the film, producing a darker image. Cavities, which are holes in the teeth, are less dense, and appear as dark spots on the lighter image of the tooth. Q: What type of toothbrush should I use ? A: There are toothbrushes with straight handles and toothbrushes with handles that slope and curve. There are toothbrush heads with tufted ends designed to clean the inside su
