Hello Min, thanks for the D2D.
I am so sorry to hear about your bad experience. The level of discomfort varies for different children, depending on their pain threshold.
However, children are generally more adaptable compared to adults and they do not usually complain of much pain.
If the discomfort is unbearable, mild painkillers e.g. Panadol, may be prescribed. In addition, the braces technology today is more advanced and discomfort is minimal.