Which of the following is a characteristic unique to dentistry compared to medicine?

The correct choice highlights a distinctive practice within the dental field that sets it apart from medicine. In dentistry, it is common for charges for dental procedures to be discussed in advance of treatment. This practice stems from several factors, including the payment structures often seen in dental care, where patients may be more involved in selecting and understanding their treatment options in terms of cost.

Additionally, the nature of many dental services, which can be more predictable and standardized compared to some medical procedures, allows for clearer pricing discussions and agreements prior to beginning treatment. This proactive approach to transparency in costs gives patients a clearer understanding of financial obligations before they commit to any dental work.

In contrast, the other options do not accurately reflect the unique characteristics of dentistry in comparison to medicine. For instance, while there are certainly elective procedures in both fields, dental care is not "rarely elective" as patients often choose whether to proceed with various treatments. The notion that dental treatments are often life-threatening is also less accurate when considering the broad scope of risks associated with medical care. Finally, while some dental care is provided by group practices, this is not an exclusive characteristic of dentistry; many medical services also operate through group practices, making it a shared rather than unique feature.