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.
1 Enamel-The hardest tissue in our body; has a hardness value of 350-500 KHN (Knoop Hardness Number). 2  Dentin-Hard tissue which is harder than bone but not enamel. 3  Hardness value is 60-70 KHN. 4  Dentin forms bulk of the tooth.5  Cementum-Hard tissue which is similar to bone but is avascular (without blood supply). Dentin-Hard tissue which is harder than bone but not enamel. 2  Hardness value is 60-70 KHN. 3  Dentin forms bulk of the tooth. 4  Cementum-Hard tissue which is similar to bone but is avascular (without blood supply).