Final answer:
Dentures should be cleaned and replaced to maintain oral hygiene.
Step-by-step explanation:
The correct answer would be option 3) Clean and replace them.
Dentures should be removed daily and cleaned thoroughly to maintain oral hygiene. Cleaning dentures helps remove plaque, food particles, and bacteria that can accumulate. After cleaning, they should be placed in a denture cleaner or soaked in water to keep them moist.
Regular cleaning and proper maintenance of dentures are essential to prevent discomfort, infection, and oral health issues.