Q: If you transplant grafts in between the thinned out areas, is there a risk of cutting previously normal roots, even if one is cautious? — J.S., Upper Saddle River, N.J.

A: Healthy hair can be temporarily shocked from a hair transplant and then shed (the process is called telogen effluvium) but it will not be permanently damaged.

Any healthy hair that is lost in this shedding process should re-grow.