What does the Gustafson method assess?

The Gustafson method is primarily utilized in forensic odontology to assess characteristics of teeth that can aid in age estimation. Specifically, this method evaluates root transparency, which is related to the age of an individual. As a person ages, the roots of the teeth undergo changes that can lead to an increase in root transparency. This characteristic can be crucial in forensic investigations where determining the age of unidentified remains is necessary.

The other options, while they relate to different aspects of forensic medicine or dental evaluations, do not pertain to the Gustafson method. The height of the humerus pertains to skeletal measurements, enamel structure relates to the outer layer of teeth but is not the focus of the Gustafson method, and muscle stiffness is not relevant to tooth assessment. Therefore, the emphasis on root transparency aligns perfectly with the context in which the Gustafson method is applied.