Look for briefs with built-in protection, for example. Essentially, these protective underpants look like regular briefs, but with an insertable pad that will absorb urine. This style may be more acceptable. If you go this route, you’ll want to make sure the briefs fit well. Depending on how advanced your loved one’s dementia is, you might want to ask them to try on some new clothes to see if they fit correctly, and include the briefs in the outfit.
If you’re having a hard time convincing your loved one to wear any form of absorbent protection, you may have to hand over the job to another caregiver, perhaps a temporary one. With someone new, there’s no personal history, which may be playing into your loved one’s rejection of your requests.
That said, sometimes people are just resistant. If this is the case, you may not be able to convince your loved one, and you’ll have to look into other options, such as protecting the furniture where they sit and deodorizing the house.