My sister pointed out that the dental practice my mother still uses is the one we went to as children. I'd forgotten that. We talked about a dentist called Dresner who had a moustache (unusual in the early sixties) and didn't believe in using any kind of anesthesia. "But he was in Croydon", I said. "No," she said, "He was here in Tonbridge." We batted this about for a while and eventually I conceded she was right. It's left me wondering how much else of my childhood I misremember.