**Question:** Miller put forth the acidogenic theory of dental caries in the year

A. 1930s
B. 1950s
C. 1960s
D. 1970s

**Core Concept:** The acidogenic theory of dental caries is a hypothesis that explains the role of bacteria in the development of dental caries, which is the deterioration of tooth enamel caused by demineralization and subsequent mineralization loss. This theory emphasizes the production of acids by oral bacteria as a primary factor contributing to the initiation and progression of dental caries.

**Why the Correct Answer is Right:** Arthur D. Miller, an American microbiologist, first introduced the acidogenic theory in the early 1960s. He proposed that dental caries occurs due to the production of acid by oral bacteria, particularly Streptococcus mutans, which leads to the demineralization of tooth enamel and subsequent mineralization loss. This theory has been widely accepted as it helps explain how cariogenic bacteria can lead to the formation of dental caries, provided favorable conditions such as plaque accumulation, carbohydrate consumption, and low salivary flow rate exist.

**Why Each Wrong Option is Incorrect:**

A. 1930s: This is too early as the acidogenic theory was introduced in the 1960s, around 30 years later.
B. 1950s: This is also too early compared to the introduction of the theory in the 1960s.
C. 1970s: While some aspects of the acidogenic theory were refined during this time, the core concept was established in the 1960s.
D. 1980s: The acidogenic theory gained significant recognition and acceptance during the 1960s, not the 1980s.

**Clinical Pearl:** Understanding the acidogenic theory helps medical professionals counsel patients on the importance of practicing good oral hygiene and limiting sugary food and beverage consumption to prevent dental caries. This theory emphasizes the role of bacteria and their acid production in the initiation and progression of dental caries.

**Correct Answer:** C. 1970s

In the 1970s, the acidogenic theory of dental caries gained more recognition, as researchers started to focus on the role of Streptococcus mutans and other acid-producing bacteria, along with factors like plaque accumulation and dietary carbohydrate consumption, in the etiology of dental caries. This refinement of the theory highlights the importance of these factors in promoting caries progression and emphasizes the need for preventive measures to reduce the risk of dental caries.