This one matches the lighter hair and unique teeth but i don't think they had an unhealthy relationship so it might not be it
https://www.mangago.me/read-manga/omae_no_hou_ga_kawaii_kuseni/
https://www.mangago.me/read-manga/satoshi_and_kakeru/
This isn't the first in their series but Satoshi and Kakeru fit that description!
I got it backwards, sorry. Still an interesting read.
this isnt it unfortunately:(
this isnt it either, but ty!
Oof, thought that might be the case but </3
If u don't get any better answers maybe try looking thru https://www.mangago.me/tag/Shark%20teeth%20/ . It's only 3 pages so it shouldn't take long and it might be on there
thank you! it wasnt here either, i might give up on it or look on other sites tbh
does anyone know this manga? i don't remember much but i know it was a black and white manga, one of them had lighter hair with unique teeth and the other had dark hair, and they maybe had an obsessed/slightly unhealthy relationship?