TLC-Services has a three-part series that helps to answer that question. See the first video below.
Over the summer, Jim Deutch, LCSW, the presenter, developed a booklet that addresses the many issues caregivers must consider when answering that question.
Please follow this link to learn how to get your copy of this valuable resource:
How Will I Know It's Time To Seek Memory Care Placement for My Spouse?
How Will I Know When It's Time for Memory Care? - YouTube