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The centers, with a reputation for caution, said experts could not prove that the virus had been transmitted between the dentist and the patient, or how, adding, ``The possibility of another source of infection cannot be entirely excluded.' Health experts said the risk that a patient would be infected with the AIDS by a health worker was very small because relatively few of these workers are infected with the virus and even if one is, the risk of transmission from a single exposure is believed to be very low

The case involved a Florida dentist with AIDS and wearing gloves and a mask who removed two molars from a young woman, the national Centers for Disease Control said in its weekly report. Two years later the woman developed AIDS. Health experts said the risk that a patient would be infected with AIDS by a health worker is very small because relatively few of those workers are infected with the virus and even if one is, the risk of transmission from a single exposure is believed to be very low. Currently the centers' nonbinding guidelines, which will now be re-evaluated, say the decision about whether a doctor, dentist, nurse or other health worker infected with the AIDS virus should continue to do these procedures should be made by the worker's personal physician and administrators of the hospital or clinic. GUIDELINES UNCLEAR

Scientists have devised an experimental treatment that dramatically stops scarring from a kidney disease in animals and holds promise for preventing the same problem in humans

Scientists have devised an experimental treatment that dramatically stops scarring from a kidney disease in animals and holds promise for preventing the same problem in humans. The authors of the report, from the University of Utah in Salt Lake City and the La Jolla Cancer Research Foundation in California, expressed confidence that the findings would apply to humans because rat kidneys so closely resemble human kidneys. Because glomerulonephritis often develops painlessly and is not recognized until after it has produced severe kidney damage or kidney failure, it remains to be determined whether the experimental therapy will be useful in medical practice

Earlier scientists had found evidence of AIDS infection dating to 1959 in one blood sample that was collected in a research study in Zaire in Africa and tested for the AIDS virus after the disease was first recognized in 1981. But no one knows if the Zairian, who was not identified, ever developed AIDS

The AIDS or human immunodeficiency virus ''has probably been stalking around the population for some time but lacked the sort of momentum that is necessary for it to create an epidemic'' until the right conditions came along, said Dr. George Williams, the University of Manchester pathologist who kept the sailor's specimens in his laboratory. An autopsy confirmed the sailor's pneumonia but could not determine what had made his body so vulnerable to the unusual infections that killed him. ''We just didn't know what we were dealing with,'' Dr. Williams said. The sailor had made his mark on the Manchester team. Through the years, ''his case would crop up in conversation from time to time at lunch,'' Dr. Williams said. ''Then it would recede very quickly when we could take it no further.''

''If you are part of a decision-making group and you don't have the problem, you don't understand how it makes you uncomfortable,'' said Dr. Lucius C. Earles 3d, a black dermatologist in Chicago who wore a beard for many years until the condition wore off as it sometimes does. Dr. A. Melvin Alexander Jr., a black dermatologist in Columbia, Md., said that in testifying in razor-bump cases he had not met judges who knew about the condition and its prevalence among blacks. ''Many take the attitude that if they haven't heard of the problem, or don't have it themselves, how can it really exist,'' Dr. Alexander said. Dermatologists say that razor bumps are found only in those who shave, the condition gets worse for those who continue to shave and remission invariably occurs after people affected by the condition stop shaving for about a month. In a new development, women who use a mechanical hair-removing device to shave their legs have developed razor bumps, said Dr. Charles J. McDonald, the chief of dermatology at Brown University Medical School in Providence, R.I. ''Over the last several months we have seen a number of young white women with ingrown hairs and pustules on their legs that looks exactly like pseudofolliculitis barbae,'' he said.

Now the Norwegian study and other studies show that anti-coagulant drugs are far more effective in treating heart attacks than most doctors believed. The new findings may bring the warfarin story almost full circle from the 1940's, when the drug was first synthesized. It was not used in people; doctors believed it was too toxic for human use until someone survived a suicide attempt from an overdose in 1951. A similar version of warfarin is widely used as a rat poison. Dr. J. Ward Kennedy, chief of cardiology at the University of Washington Hospital in Seattle, said that he was surprised by the findings and that they ''could have a major impact on the treatment of heart attacks.'' He added, ''The size of the reduction is as good as anything else we do in cardiology.''

In a surprising finding from a study in the Bronx NY, two of the most common ailments of the elderly, heart attacks and Alzheimer's disease, have been linked for the first time