Климат тот же, Москва - Торонто. Прально, композитных пломб до  1993 года в РФ не было, а на западе ставили их с 60-х. Вот и ответ про плохую стоматологию.The first composite filling, invented in the 1960s, gave way to a more alternative option for those looking for a filling. Compared to the traditional resin and silicate options of the time, composite fillings had improved durability that couldn't be matched, allowing people to overcome their issues with their teeth.https://bethesdafamilydentistry.com/the-history-of-the-composite-filling/