BAD IDEA
Can I use sewing thread instead of dental floss?
No, sewing thread is not dental floss—unless you want torn gums and dental disaster.
Using sewing thread instead of dental floss is a one-way ticket to gum damage and infection. Dental floss is specially designed to be safe, thin, and shred-resistant. Sewing thread can be too rough, fray, and even cut your gums, leading to pain and possibly infection. Stick to actual dental floss or floss picks to keep your mouth healthy and your dentist happy.