In 2022, the requirement for training in all Level 1 expanded functions before Level 2 was:

The correct understanding of the requirement for training in all Level 1 expanded functions before proceeding to Level 2 indicates that this mandate was eliminated in 2022. By removing the requirement, the Iowa Dental Board allowed dental hygienists greater flexibility in pursuing advanced training without the prerequisite of having completed all Level 1 functions. This change reflects an evolution in the training structure, enabling dental hygienists to specialize or enhance their skills according to their professional goals without the need to fulfill an exhaustive list of prior functions.

The other options do not accurately reflect the regulatory changes made; reinforcing would imply that the requirement remained intact and was emphasized further, while extending would suggest an addition or prolongation of existing conditions. Clarifying could imply an adjustment in the comprehension or interpretation of the requirements rather than a change in the requirement itself.