Over-whitening can also cause teeth to become thin and brittle and can lead to high sensitivity and discoloration as tooth enamel becomes translucent.
美白牙齿过度，会使牙齿变得薄弱。同时，由于牙釉质变为半透明状，会导致牙齿高度敏感、变色。
2
It has been used in paint because it is less susceptible to discoloration than lead(II) carbonate hydroxide, but it is now less used because of fears about lead poisoning.