Oats are more tolerant to extreme conditions than some of their grassy relatives, like wheat, and it is probable that they began to be cultivated in Europe for that reason. This grain continues to be farmed all over the world in areas that are not suited to more finicky grains.
Dental chart (tooth numbering) Teeth are numbered in order to identify them with ease. However there are two common systems of numbering teeth that can confuse unless you know which one you are using. America uses the Universal numbering system and numbers teeth like this:
Tooth Eruption Chart. Permanent Teeth. Permanent teeth usually begin to appear (erupt) around the age of six years. By age 21, all 32 permanent teeth have usually erupted. The chart below identifies the types of permanent teeth and their usual eruption dates. Flag Status: Full Staff.