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We all have two sets of teeth that appear in a life time. When a child is born there are not teeth in the mouth. The first set of 20 teeth start appearing by the age of 6 months and are completely set in the mouth by the age of 2 years. This set of teeth, most commonly called as the "Milk Teeth" are the "Decidous" set of teeth. These teeth start dropping off by the age of 6 and are completely replaced by a set of 28 permanent teeth by the ages or 12 to 14. In addition four more back teeth may or may not erupt completely by the age of 18 to 20. These are commonly refferred to as the "Wisdom" teeth and are correctly known as the 3rd molar. These teeth may actually erupt at very late ages between 20 and 30 or even 30-40. On occasion they are also known to erupt at the age of 55 or 60.
All teeth can be divided into two parts. The part of the tooth that can be seen in the mouth is known as the "Crown" of the tooth and the part that is embedded in the bone is known as the "Root" of the tooth. Usually the Root is about twice the length of the Crown. All teeth have a outer layer of a hard mineralized component known as the "Enamel". Below this hard Enamel is a mineralized but still a slightly softer layer known as the Dentin. The "Dentin" in turn encloses the core of the tooth formed by the Pulp Chamber and the Root Canal. This Pulp Chamber and the Root Canal houses blood vessels and nerve tissue which provided nutrition and sensations to the tooth. Table for more Information |
Decidous Teeth
Upper & Lower Set Two Central Incisors each Two Lateral Incisors each Two Canines each Four Molars each Permanent Teeth Upper & Lower Set Two Central Incisors each Two Lateral Incisors each Two Canines each Four Premolars each Six Molars each |
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