Australian Dental Council (ADC) Test 2025 – 400 Free Practice Questions to Pass the Exam

The correct answer relates to the specific bacterium known to produce an orange stain on teeth. Serratia marcescens is a gram-negative bacterium that can lead to the formation of orange-colored biofilms, often observed on surfaces in moist environments, including the oral cavity. This bacterium is commonly found in various environments and can adhere to the dental surface, contributing to discoloration.

The presence of Serratia marcescens in the mouth can lead not only to aesthetic concerns but also to the potential for dental complications if not managed appropriately. Understanding the role of this bacterium helps dental professionals guide patients in maintaining better oral hygiene and preventing the development of such stains.

Focusing on oral health, it's essential to recognize that not all bacteria associated with the oral microbiome contribute to staining. Some bacteria may play a role in carious lesions or other forms of dental decay but do not cause discoloration of the teeth in the same manner as Serratia marcescens. Providing patients with information about how to prevent the growth of such bacteria can enhance their overall oral hygiene practices.