A living tooth is classified by science as an organ because it is made
up of multiple tissue types, each with an essential function. These
tissue types are:
How God Engineers a Tooth
Enamel--the body's hardest mineralized surface, which seals and protects the interior.
Dentin--a bony substance which serves as a cushion for chewing forces.
Pulp--blood vessels and nerves which nourish and give perception to the tooth.
Cementum--the hard outer surface of the tooth where there is no enamel.
Periodontal ligament--the connective tissue that attaches to both the cementum and the jawbone anchoring the tooth.
It takes 14 months for a tooth to be completed in a human. The process of tooth formation is called "a tiny marvel of design and construction" (Scientific American, August 2005, page 37). Six to seven weeks after conception when the human head is being formed, tooth development begins. There are four steps that have been identified in the design and engineering of human teeth:
Mouth surface cells at the tooth location thicken slightly and gene activity within its cells sends signals to underlying tissue which surround the surface cells. This forms a tooth bud. This is done by week seven or eight.
The thickened surface cells become a cap, and at the center of this cap a structure forms called an enamel knot. This knot sends signals to all other cells to direct their growth. This is accomplished by the ninth week after conception.
The developing tooth has a bell shape with cells forming on the top that will become enamel and cells under that which will become dentin. This is completed by the fourteenth week.
Roots develop, completing their formation six to twelve months after birth.
It is difficult to comprehend how all of these cells know how to do what they do and when to do it. Scientists have been intercepting the signals mentioned above, and they are now trying to see if they can grow human teeth artificially to replace the false teeth that so many of us know about, which are less than ideal. Sending signals and controlling construction timing is a function of intelligent and purposeful design--not chance. Our teeth are wonderfully designed and planned, and their construction gives us insight to the wisdom in and complexity of the mind of God.
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