It's also possible that you have the correct application on your PC, but .afp files aren't yet associated with it. In this case, when you try to open a .afp file, you can tell Windows which application is the correct one for that file. From then on, opening a .afp file will open the correct application.
Dentin is found underneath the enamel surface of the tooth and underneath the cementum that forms along a tooth's roots. Made of living cellular material and tissue, dentin is what makes up the majority of a tooth's structure. Dentin is a bone-like substance that contains microscopic tubules. Unlike enamel, exposed dentin is highly susceptible to the bacteria that cause dental cavities and can cause tooth sensitivity. Cementum.
The surface enamel is the hardest layer, and under that is the second hardest layer, dentin. Dentin is important because it surrounds and connects to the pulp of the tooth, which is made up of living connective tissue and cells called odontoblasts, and found in the middle of your tooth. The pulp is where your blood vessels, nerves, and connective tissue are found, so you really donât want to mess that up. Problems start when you get a cavity that eats away your enamel, dentin and cementum - a calcified substance covering the root of a tooth - and exposes the pulp.