Dentistry Lesson

Good evening,my dear English learners! Today there is a dentistry lesson.))) Hope you are not afraid of dentists.)))
Here is the link to read:
https://theconversation.com/holistic-dentistry-more-poppycock-than-panacea-41177
Enjoy!!

Questions:
1. What does "holistic" mean?
2.Should dentists rely on alternative medicine?
3. What did Campbell do?
Vocabulary
alleviate
decongestant