Paradoxes. Cheese contains saturated fat but on the other hand it helps neutralise acids in the mouth. In small amounts, maybe it's okay. In any case best ask a dentist about options. Paging @Fang_Farrier in case he has any ideas for oral hygiene for patients with limited mobility?
If you Google caring for smiles guide for families, there is a resource there.
But ideally a domiciliary visit from the dental team would be the best idea.
These might be from your own dentist or by the local community dental service.