It will be helpful if you could specify what you mean by specific regional sectors?

I am sure you must have already looked at this:

The WHO Global oral health status:

https://www.who.int/publications/i/item/9789240061484

The World Health Assembly approved a Resolution on oral health in 2021 at the 74th World Health Assembly

https://apps.who.int/gb/ebwha/pdf_files/WHA74/A74_R5-en.pdf

Here are a few studies that I would suggest that you look at:

https://www.thelancet.com/pdfs/journals/lanpub/PIIS2468-2667(22)00315-2.pdf

https://www.mcgill.ca/newsroom/channels/news/big-sugar-and-neglect-global-health-community-fuel-oral-health-crisis-298500

Article Oral Health Inequalities and the Corporate Determinants of H...

https://resource-allocation.biomedcentral.com/articles/10.1186/s12962-021-00309-0/tables/2

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7938029/

Article Insurance-Related Barriers to Accessing Dental Care Among Af...