What is this white, painful mark on my frenum?

This sub is a place for Dental Hygienists, Dental Hygiene students, and the general public to ask questions and comment about dental hygiene. Dental hygiene is a broad topic so we are pretty lenient on topics. Please read the rules for clarity. All posts must be approved by a mod before they will show up so be patient with us. Don't forget to floss your teeth!
Painful white line on labial frenum

This sub is a place for Dental Hygienists, Dental Hygiene students, and the general public to ask questions and comment about dental hygiene. Dental hygiene is a broad topic so we are pretty lenient on topics. Please read the rules for clarity. All posts must be approved by a mod before they will show up so be patient with us. Don't forget to floss your teeth!