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From the population of teeth we pick up two teeth �1� and �2� FROM AN SPECIFIC MOUTH and analyze how much these two teeth are alike each other.

Thereafter we pick up again two new teeth �3� � and �4� �FROM ANOTHER SPECIFIC MOUTH and analyze how much these two teeth are alike each other.

Certainly (1=2) and (3=4) are more alike each other than (1=3) or (1=4) or (2=3) or (2=4).

Belonging to a NATURAL MOUTH may indeed influence tooth health.