Saxena, S. ., Pundir, S. ., & Aena, J. . (1969). Oratest: a new concept to test caries activity. Journal of the Indian Society of Pedodontics and Preventive Dentistry, 31(1), 25-8. https://doi.org/10.4103/0970-4388.112400 (Original work published 1969)