DMFT Index, is universally employed for dental studies in the population, quantified by the WHO (World Health Organization). DMFT (decayed, missing and filled permanent teeth) Index was developed by Klein, Palmer and Knutson in 1938. It was used by first time to determine the dental health of children attending to Primary schools in Maryland (USA). Is the clue for studying the prevalence of the decay teethn in different countries.

This index is the result of the sum of the decayed, missing and filled permanent teeth.

Decayed tooth, the enamel is severely undetermined, a floor or wall with softening; also presents dental fillings.

Filled permanent tooth, where you find one or more surfaces with permanent restoration and without caries. In this case, tooth with crown because of a previous tooth decay are considered.

A tooth lost due to decay, which has been removed because of tooth decay.

Tooth extraction suggested, by previous decay reasons or if it had a total destruction of the dental crown, associated to the loss of the vitality of the pulp.

Healthy tooth, if there is not evidence of clinically treated tooth decay.

In 1944, Gruebbel proposed to add the “e”, where the “e” means “indicated for extraction”. The index is obtained of adding up permanent decayed teeth, lost and sealed, including extractions suggested, among the total of individuals examined. 28 teeth were only considered. It must be gotten by ages, recommended by the following ones are: 5-6, 12, 15, 18, 35-44, 60-74 years. DMFT at the age of 12 years old is the most used to compare the oral health in different countries. This strategic age is the intermediate point of life with greater incidence of decay and the epidemiological indicator which shows  the oral health of the children and adolescent population. The index for permanent dentition is always written with a capital letter and for primary dentition with small letter.


Those factors geographical, historical and cultural are determinants in the rates of caries. Gender, male or female, shows the highest incidence in girls than in children by the earliest appearance of teeth in children.

The Eastern Mediterranean region has higher rates of caries than most industrialized countries (Saudi Arabia, Syria, Morocco, Kuwait, Jordan and Lebanon). This is due to the high level of consume of sugar after its price decreased.

WHO (2007), recommended the incorporation of programs for the promotion of oral health and prevention of chronic diseases. This concern was addresed by the United Nations (UN) in General Assembly (2011) on the prevention and control of noncommunicable diseases. They established to upgrade the attention and put the focus on the rising levels of chronical diseases such as dental health.

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