Dental Care Every Day: A Caregiver's Guide
This excellent booklet, which can be downloaded for free at the link in green or by copy and paste:

www.nidcr.nih.gov/NR/rdonlyres/01DC53C1-BAEC-4D3D-B615-0F6A2C6EEB82/0/DentalCareEveryday.pdf

provides very helpful information on how to assist your loved one in caring for his teeth.