|
Tooth enamel, which is the hardest substance in the human body, cannot be replaced if lost. |
|
If it is lost, tooth enamel cannot be replaced as it is the hardest substance in the human body. |
|
Tooth enamel, which cannot be replaced if lost, is the hardest substance in the human body. |
|
Tooth enamel is the hardest substance in the human body and it cannot be replaced if it is lost. |
|
In the human body, tooth enamel is the hardest substance and it cannot be replaced if it is lost. |