Which of the following is a common barrier to accessing dental care?

High costs associated with treatments are indeed a common barrier to accessing dental care. Many individuals, especially those without insurance or with high deductibles, may find the price of dental care prohibitive. This includes not only the cost of routine treatments like cleanings and exams but also more extensive procedures such as root canals or crowns. When patients face significant financial burdens, they might delay or completely forgo necessary dental treatments, leading to worsening oral health issues over time.

In contrast, while lack of interest from patients can be a factor for some, it does not broadly represent a systemic barrier to accessing care. Limited public awareness of dental health may contribute to misunderstandings about the importance of oral hygiene and regular dental visits, yet it doesn't directly impede access like financial constraints do. The option mentioning an abundance of dental clinics implies availability, which typically alleviates barriers rather than creates them, thus not correlating with the concept of access issues.