Abstract: The present invention provides a composition comprising specific self-assembling peptides, which are capable of self-assembly at a pH below 7.5 and at least physiologic ionic strength, e.g., PI 1-4. PI 1-8, PI 1-14, PI 1-13, PI 1-12, PI 1-28, PI 1-29, PI 1-2, PI 1-5, PI 1-17, PI 1-19, PI 1-20, PI 1-12, PI 1-16, PI 1-18, PI 1-26 or PI 1-31 for use in treating an oral disease selected from the group consisting of gingivitis, periodontitis and/or peri-implantitis in a subject. Said composition may be used, after suitable cleaning procedures, for filling pockets formed adjacent to teeth in said diseases, which enhances tissue regeneration. The composition may be suitable for controlled release of an active agent, e.g., an antimicrobial or antibiotic agent. The invention also provides a kit suitable for said treatment further comprising self-assembling peptides suitable for forming a second layer on top of the first composition.