Hair Dye Answers

I already unfortunately have a bit of a receeding hairline, & I’m scared to put hair dye/bleach directly to scalp, but that’s how they do it since I get my hair done to be lightblonde from med/dark brown.
They SAY it doesn’t hurt it, & they don’t use bleach, they use a special kind of a lightening dye, but it still has to go MANY shades lighter, & I’m afraid if this might damage my hair & the follicles. If anyone has any idea let me know!