Coconut Oil is believed to help improve a persons brain power and by doing that it's supposed to help prevent or even cure dementia.
But as of now there's no 100% scientific evidence that shows that Coconut Oil will prevent or cure dementia.
But some people who've started to get dementia have shown improvements when taking coconut oil so it's possible and Coconut Oil is healthy any way so it's still good to take the Coconut Oil even if it doesn't treat or prevent dementia.