A diagrammatic dental educational aid shows an image of all of the teeth present in relation to an average age selected. The diagrammatic representation of eruption of teeth is presented in chronological order and is labelled in relation to average age at which each tooth eruption is expected to occur. The representations of erupting teeth are printed onto two flexible sheets Y and moved in relation to a viewing windows F representing upper and lower jaws. The age of the person is framed at any one time through two cut out windows G. The printed sheets Y representing the eruption of upper and lower teeth are separate but are moved simultaneously by scrolling them onto a spindle J by hand. Rotating a second spindle D to which the other ends of both sheets are attached reverses this movement. The whole of the deciduous and permanent tooth eruption sequence can be also be viewed as a continuous moving image or each stage of eruption of teeth can be viewed as a static image labelled with the age at which this is likely to occur and showing all of the other teeth likely to be present at the time.
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