What is the main reason for a denture to fail in its intended purpose of successful tooth replacement?

The main reason for a denture to fail in its intended purpose is that it is easily removed. A properly fitting denture should provide stability and comfort, allowing patients to chew food effectively and speak clearly. If a denture can be easily removed, it may not stay in position during normal activities, leading to discomfort, difficulties in eating, and issues with self-esteem related to appearance. Stability is crucial for the functionality of a denture, and if it can be taken out with minimal effort by the patient, it signifies a lack of retention and can ultimately compromise its effectiveness as a tooth replacement.

While the other options highlight various concerns—such as the possibility of breakage, challenges in cleaning, or cost—these factors do not directly relate to the core function of a denture. A denture's primary purpose is to provide a stable and fixed replacement for missing teeth, and ease of removal directly affects this essential function.