Recently the dogma in dentistry has shifted towards preserving teeth for as long as possible - even for patients who are elderly or have underlying medical conditions.
The rise in life expectancy lead to a rise in prevalence of chronic diseases. This means that there are more and more elderly patients who need and seek dental care - however the medical background of these patients affects that type of treatment that is best for them as well as the manner in which treatment is administered.
Treating someone who takes certain medications or who has underlying illness like heart failure, cancer, or uncontrolled diabetes could be completely different from the treatment of a healthy person.
Treatment in such cases needs to be adjusted and the provider needs to be able to handle any emergencies that arise during treatement.