It is conventionally performed through a hole drilled into the crown of the affected tooth, namely orthograde root canal therapy.
根管治疗手术通常通过在受影响的牙齿牙冠中钻孔完成，即矫正根管治疗。
He argues that tooth crowns and roots have a high genetic component, minimally affected by environmental and other factors.
他认为，牙冠和牙根有很多的遗传成分，受环境和其他因素的影响很小。
Locals were suffering from tooth decay and bone degeneration. Agricultural production was also adversely affected.
当地人饱受牙齿受损和骨质酥松的痛苦，农作物的生长也受到严重影响。
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