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1 Tufts College Dental School, Boston, Mass.
At approximately three monthly intervals single quadrants of the teeth of 139 students, aged 18 to 40 years, were treated with solutions of 1.0 per cent sodium fluoride of 0.06 per cent lead fluoride.
After approximately fourteen months, the quadrants treated with sodium fluoride showed 44.5 per cent less new D.M.F surfaces, or 56.6 per cent less new carious surfaces, than did the untreated control quadrants on the opposite sides of the mouths.
The quadrants treated with lead fluoride showed 27.5 per cent less new D.M.F. surfaces, or 38.5 per cent less new various surfaces, than their control quadrants.
Submitted on March 30, 1949
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