## Core Concept
Jiffy dentures, also known as immediate dentures, are temporary or provisional dentures provided immediately after tooth extraction. The primary goal is to allow the patient to have a more natural appearance and to facilitate eating and speaking during the healing period. However, their construction is based on pre-extraction records and the existing mouth anatomy.

## Why the Correct Answer is Right
The main disadvantage of jiffy dentures is that **they undergo significant changes in fit and appearance** over time due to the rapid alterations in the alveolar ridge and surrounding tissues post-extraction. This process, known as alveolar bone resorption, leads to a decrease in the height and width of the alveolar ridge. As a result, jiffy dentures may become loose, requiring multiple adjustments and potentially leading to discomfort, irritation, and the need for more permanent dentures.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is not provided, so we cannot assess its accuracy.
- **Option B:** Similarly, this option is not provided for evaluation.
- **Option C:** Without the content of this option, we cannot determine its correctness or incorrectness.
- **Option D:** As with options A through C, the content is not provided for assessment.

## Clinical Pearl / High-Yield Fact
A key point to remember is that jiffy or immediate dentures are not meant for long-term use. They are a temporary solution provided to help patients adapt to life without teeth immediately after extractions. **Significant bone resorption occurs within the first year post-extraction**, necessitating frequent follow-ups and potential adjustments or the creation of more definitive dentures.

## Correct Answer: D. Require multiple adjustments due to post-extraction changes.