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Shed deciduous teeth were collected in 1962–1965 from 25 schools in Denmark, the Faroes and Greenland. Approx. 10,000 teeth from children born in the period 1950–1958 are included in the present investigation, which compiles 215 90Sr analyses. The 90Sr level in deciduous teeth crowns increased by a factor of four from 1953 to 1958. Faroese teeth contained nearly 4 times as much 90Sr as teeth from Denmark and Greenland. Incisors contained approx. three fourths of the level found in second molars. The 90Sr diet levels measured in 1962–1966 in Denmark, the Faroes and Greenland showed a similar variation between locations as the 90Sr in deciduous teeth from children born in 1950–1958 in the same areas. The 90Sr mean level in shed deciduous teeth is considered as an estimate of the 90Sr content in the tooth donors bone when he was 1 year old.