But the overall rate is falling. My friend’s young daughter, who recently asked if she would ever have “in and out” teeth like her grandparents, can be relatively confident that she will not.
当然，牙齿问题并没有完全消除。今天，全世界65-75岁的老人中有30%没有牙齿，穷人和弱势群体牙齿脱落的比例更高。但整体比例正在稳步下降。我朋友的小女儿最近曾问有一天她会不会也像爷爷奶奶那样有“可以拿下来”的牙齿，我可以相对肯定的告诉她不会的。