Polarised light micrograph of an unstained ground section of adult molar teeth anchored in alveolar bone. The tooth enamel (the hardest tissue in the body) overlying the tooth crown has been significantly reduced in depth due to wear and grinding of the teeth. The crown shows many radial lines (green-grey colour) representing dentinal tubules of the dentin tissue. The tooth pulp is enclosed by the crown. Magnification: x3.5 when width printed at 10cm.