They vary from country to country. See, for example:
Komabayashi, T., Raghuraman, K., Raghuraman, R., Toda, S., Kawamura, M., Levine, S.M. and Bird, W.F., 2005. Dental education in India and Japan: implications for US dental programs for foreign-trained dentists. Journal of dental education, 69(4), pp.461-469.
Article Dental education in India and Japan: implications for U.S. D...