Abstract 1. 1. This study was designed to evaluate the effect of vitamin C upon alveolar bone height. 2. 2. Fifty-three dental students were observed for a twelve-month period. Half of the students refrained from citrus intake; the other students received frozen orange juice supplementation daily. 3. 3. On a mean basis, the nonsupplemented group lost 0.3 per cent more aleovlar bone than the supplemented group. However, this difference was not statistically significant. 4. 4. Extrapolations of the results of the one-year study were made to age 50. On a mean basis, nonsupplementation yielded 50 per cent alveolar bone loss in contrast to only 25 per cent for the supplemented group. 5. 5. An attempt was made to check the validity of the extrapolations. This check was first made by measuring alveolar bone loss in the same teeth and by the same technique in forty-six patients who visited the clinic for dental care. The mean alveolar bone height values for these subjects at ages 35, 40, and 45 differed from the students at the extrapolated ages of 35, 40, and 45 by 0, 5, and 1 per cent, respectively. 6. 6. A further check was made by plotting alveolar bone height of 35-, 40-, and 45-year-old dental patients with high and low plasma ascorbic acid levels against the students in this study extrapolated to these same ages. The differences ranged from 1 to 7 per cent. 7. 7. It would be highly desirable to compare these findings with those derived from a longitudinal study extending over a period of two to three decades.