I do not recommend anyone perming their hair.
You can get curls on your hair for days, by braiding them after they've been washed, to where you want the curls to start.
Take the braids out, finger comb to style.
If you want a loose curl, braid them larger, but if you want a tighter curls, braid them smaller & more sections.
Chemicals containing formaldehyde causing cancer - is NOT MY THING. I now stand up for cancer.
Both mom & my sister were affected by cancer. Mom started perming my hair in 2nd grade.
I started again in the 80's & 90's, and I had frequent migraines. Mom had bloody noses for 75 years, and doctors can't understand WHY.
Chemicals can enter the body through the skin.
Google FDA.gov & search for Hair Dye & Relaxers.
Google: Hair Dye FAQ's Are Hair Dyes Safe?