Oil filter change vs oil change

I am a scientist/biologist by education and a dentist by profession. How is this for science? Why is it that dental insurance companies pay for 2 checkups and 2 cleanings every year???? Because a tooth paste company back in the 50s came up with a marketing campaign that said to brush 2xday for 2 minutes and see your dentist 2xyear. The famous 2x2x2 from pepsodent toothpaste. An insurance company said (paraphrasing here), "that sounds like a great idea". Thus 70 years later that is the accepted "norm" for dental care.

Compare that to modern oils, filters and automotive maintenance and you get the "change your oil every 3000 miles and your filter while you are at it after a hundred years of automotive service. I guess you can complicate it by having old technology vehicles and modern chemicals and confusion prevails.

I guess that is why much of what we do to is because that is what dad did and his dad before that. Thanks for the replies.