Many research efforts in several oral health areas have been made in a search to obtain reliable and orderly information for the pathological dental or handicapping conditions. An example of this would be Kleins scale for the determination of caries prevalence CPO. This instrument has been internationally validated by health regulating institutions like the World Health Organization WHO, and the Public Health Organization PHO.
En el área de la salud oral se pueden observar los esfuerzos que se han realizado tratando de obtener información ordenada y confiable de condiciones dentales patológicas o invalidantes, como la escala de Klein para determinar la prevalencia de caries CPO, instrumento validado internacionalmente por las instituciones rectoras de salud OMS, OPS.