Coronal Polish Certification Practice Test

What type of stain is likely to be more challenging to remove from teeth?

1. Extrinsic stains

2. Intrinsic stains

3. Transitory stains

4. Superficial stains

The correct answer is: Intrinsic stains

Intrinsic stains are indeed more challenging to remove from teeth compared to extrinsic stains. This is because intrinsic stains occur within the tooth structure, usually in the dentin layer, and are often the result of factors such as developmental conditions, aging, or excessive fluoride exposure during early childhood. Since they are embedded within the tooth material, these stains do not respond well to typical whitening treatments or professional cleanings that focus on surface removal. In contrast, extrinsic stains are located on the surface of the teeth and are often caused by dietary factors or habits such as smoking. These stains can usually be removed through professional cleaning or at-home whitening products, making them less difficult to treat. Other types like transitory stains are temporary and superficial stains are located on the surface, both of which can often be easily addressed. Thus, intrinsic stains present a significant challenge for both dental hygienists and patients looking for effective stain removal options.