sample="quota" bates="1003077754" isource="pm" decade="1950" class="ni" date="19480514" PHONE, OFFICE, 32463 PHONE, RES., 31342 DR. L. LYMAN DENTIST ROOM 209 FEDERAL Bldg. 18 NORTH PHELPS STREET YOUNGSTOWN, OHIO 2 May - 14 - 1948 W. F. Greenwald Research Director: In reply to your letter of Apr. 22 -48 I wish to give you the nature of my experiments and the results. My first experiments I conducted with the aid of my daughter who is and has been for many years a fairly heavy smoker. It happened seemed that her teeth became yellow and in need of dental cleaning nearly every month from the effects of smoking; I therefore thought of having her smoke a special brand of cigarette for a thirty, sixty and ninety day period. and I made regular weekly examinations to determine the degree of stain. When she used one certain popular brand of cigarette I had to clean her teeth within three weeks from the start of the experiment; another popular brand, six weeks, and Phillip Morris eleven weeks. I did not stop my experiment with her case alone; I found similar results in six other experiments with patients of both sexes. The above experiments were all on patients who had all their natural teeth. I then tried to find whether different brands of popular cigarettes affected plates and other artificial dentures differently. I did find a difference in the degrees of stain, and I am still keeping up my experiments. I would like to get your reactions to any conclusions and certainly will like to learn what results your research dep't have gotten. Resp'y yours,