Sorry but around 90% of dental treatment is preventable https://www.who.int/news-room/fact-sheets/detail/oral-health#:~:text=Overview,tooth%20loss%20and%20oral%20cancers.
You are right some things make dental problems more frequent eg
decay .... dry mouth caused by disease or medication eg antidepressants, or radiotherapy of saliva glands
gum disease .....smoking, alcohol, diabetes and a genetic component
weak teeth........ very rare conditions like amelogenesis imperfecta and more commonly Hypomineralisation
However even with these problems control of diet, improved oral hygiene and use of fluoride will prevent most problems or stop them getting worse. Treatment of gum disease is 90% patient effort , 10% dentist input.
Cleaning and scaling should not be necessary , tartar only forms when plaque has laid , undisturbed, on the tooth for at least 24 hours , in other words if a brush , interdental brush or floss cleaned away that plaque in that 24 hour (or more) period there would be no tartar.
People living where there is hardly any sugar intake (eg in the past Inuits, and large parts of Africa ) had no decay , but once sugar was introduced they developed problems with decay .
Unfortunately in this country we eat far in excess of the recommended daily sugar intake (children even higher) and the average U.K. child eats 7 times a day with many grazing throughout the day. Eating or drinking anything sugary more than three times a day will cause decay.