Coronal Polish Certification Practice Test

A stain that appears dull yellowish/brown is generally caused by what factor?

1. Excessive fluoride use

2. Poor hygiene

3. Teeth grinding

4. Overbrushing

The correct answer is: Poor hygiene

The presence of a dull yellowish or brown stain on teeth is typically associated with poor hygiene. When oral hygiene practices are insufficient, plaque and tartar can accumulate on the teeth. This buildup can lead to discoloration as plaque harbors bacteria that produce colorants when they metabolize substances in the mouth. With time, if the plaque is not removed through regular brushing and flossing, it can harden into tartar, which can take on a yellowish or brown hue, resulting in noticeable staining on the teeth. In contrast, excessive fluoride use is more likely to cause a mottled enamel appearance known as dental fluorosis, rather than dull yellowish or brown stains. Teeth grinding may lead to wear or chips on teeth but does not typically result in discoloration. Overbrushing might result in wear of the enamel and increased tooth sensitivity, but it does not cause stains of this nature. Hence, the link between poor hygiene and the development of dull yellowish or brown stains on teeth is the most significant factor in this context.