Decay and tooth loss have been a problem since prehistoric times. (We have evidence of dental fillings being placed to stop cavities since about 3700 BC.)
As our food became more plant based and more sugar was used, tooth decay and loss got worse.
Many, if not most, adults in Colonial America suffered from tooth decay and tooth loss.
This continued to be a huge problem until WWII. (It may shock you to know that most people did not brush their teeth every day until after World War II.)
After WWII, the dental community stepped up and began to market how to keep teeth.
“Brush twice a day and see your dentist every 6 months” .
However, the dental community knows that every 6 months is not appropriate for every patient. The dentist’s role is no longer just to detect cavities and fill them. We are also concerned about gum disease, oral cancer, joint problems, acid reflux, sleep apnea, tooth wear and breakage, along with cosmetic concerns.
(I would say that every patient needs to be seen at least once a year to make sure there are no problems brewing. People seem to forget that new medications, the aging process, and diet changes will affect the mouth.)