This thesis aims to investigate the oral/ dental health of the Iron Age population from Promtin Tai archaeological site, Lum Khao Sub-district, Khok Samrong District, Lopburi Province, approximately dated to 1,400-1,600 BP. The material consists of fourteen individuals (196 teeth): four males, three females and seven individuals whose sexes could not be determined.

The study is based on the four oral health indicators like carious lesions, antemortem tooth loss (AMTL), advance attrition, and abscessing. The results suggest that the Iron Age population of Promtin Tai had better oral health more than the other prehistoric populations in Thailand. There was no evidence of AMTL and the rates for advance attrition was 6.8 percent (13/192). In addition, the caries prevalence rates were 0.5 percent (1/192), statistically significantly lower than the coastal populations from Khok Phanom Di and Nong Nor, and also the populations from the Khorat plateau, e.g. Ban Chiang, Non Nok Tha, Ban Na Di, Ban Lum Khao and Noen U-Loke.