How can I get her dentures out at night?

Why? Are they partials or full. Partials maybe a swallow risk. Fulls not so much. If they aren't a swallow risk and she takes them out to clean them why not just leave them in. I had this discussion with my mom's dentist before. She said unless it's a swallow risk then it's not a problem.

I have a very good friend who has worn dentures since she was 20. She only removes them to clean them and puts them right back in. I would not worry too much, see if she will brush her teeth in place.

Is she verbal? Can you ask her to take them out? You’ll have to do it kindly and calmly. It’s possible she doesn’t want anyone’s fingers in her mouth or she thinks you’re “stealing” them. She’s reacting normally for someone who has dementia. A lot of people who suffer from it have the “fight or flight” reaction when they feel threatened. In addition, if you’re doing this at night, night time is very difficult for some. Talk to her doctor to see if she might benefit from a mild sedative.

Yes, She's fighting and will not take them out. She won't open her mouth and pushes my hands away.

Can you give us more detail? Is this person fighting you? Are her dentures cerybdifficult to remove and you don’t want to hurt her? Please repost with more details.