The DMFT (Decayed, Missing, Filled Teeth) index is used to assess the dental health of a population by counting the number of decayed (D), missing (M), and filled (F) permanent teeth (T) in an individual. It provides a cumulative measure of dental caries experience, as it includes both untreated and treated cases of dental decay. This index helps in understanding the overall oral health status and the need for dental care in a population.

A measure that has validity is necessarily reliable, as reliability is a prerequisite for validity. However, a measure that is reliable does not necessarily mean it is valid. Validity refers to the degree to which a measurement tool accurately measures what it is intended to measure. Reliability is the consistency of the results produced by the tool.

The Snyder test is a microbiological test used to detect the presence of specific bacteria associated with dental caries, primarily Streptococcus mutans. It involves taking a sample of plaque, adding a sugar solution, and observing for the formation of acid that indicates bacterial activity and the potential for tooth decay. It is not used to detect fungal growth on skin or determine the pH of crevicular fluid.

Ans. 2.. (Europe 1964 trade name Duraphat 25-75% caries reduction)

Consistent methods of evaluating a patient’s oral hygiene are considered desirable because they allow the patient’s commitment to improvement to be monitored (Answer: 4). By using the same method at each visit, dental professionals can track changes in the patient’s oral health and hygiene habits over time. This helps in tailoring the oral hygiene instructions and treatment plans to the patient’s individual needs and progress.