The appearance of pink teeth after death is a phenomenon long familiar to forensic dentists. Although the application of modern techniques has shed some light on its aetiology, elucidation of the ultimate mechanism underlying the phenomenon is still awaited. In this paper, previous literature on the subject is surveyed, and an experimental approach under standardized conditions to allow analysis of possible causes and biological mechanisms of the pink-teeth phenomenon in rats is described. The experimental results were consistent with most previous observations. It seems probable that colouration of the teeth would be found in those regions of the jaws where the blood is seeking on the basis of gravitation hypostasis. The primary red colouration is most likely due to haemoglobin derivatives within the necrotic pulp tissue in cases in which blood has accumulated in the head and the dependent lividity (hypostasis) is obstructed. The authors discuss the likely causes for the development of the pink teeth phenomenon. It seems that this phenomenon is more dependent on physical than chemical factors after death.