question: Hello doctor, I had some composite fillings placed on the front surfaces of several teeth last year, at the top of the tooth near the gum line where dentine had been exposed due to wearing away of the enamel. Several of the fillings have fallen out. They were not worn down by brushing, but actually they are detached as a whole from the tooth. I was shocked that they had lasted less than a year because online searches indicate they should last for five to seven years. Under normal circumstances, how long should composite fillings last?