Needle vs. needle: the battle to banish black triangles between your teeth
Symptom relief
Completed
This study tested two non-surgical injections to fill in small, dark gaps (called black triangles) that can appear between teeth due to gum loss. Thirteen participants received both treatments—one made from their own blood (i-PRF) and one a gel (hyaluronic acid)—on different side…
Phase: PHASE4 • Sponsor: Altinbas University • Aim: Symptom relief
Last updated Mar 24, 2026 12:02 UTC