 Three years after Price died in Santa Monica, California, a special review issue of the "Journal of the American Dental Association" confirmed the shift of standard of care from extraction back to endodontical dentistry.Compared to modern research, Price's studies lacked proper control groups, used excessive doses of bacteria, and had bacterial contamination during teeth extraction, leading to experimental biases.Beginning in 1894, Price started to consider diet as the primary factor causing tooth decay.