The present invention relates to an improved blister packaging (1) for active agents, e.g., peptides that need to be dissolved before application, for example, self-assembling peptides such as P11-4. In particular, the present invention provides a blister packaging (1) that can be both conveniently used and more cheaply produced than previous packaging, as well as use thereof in application of the
peptide, e.g., in treatment of subsurface caries lesions. In one preferred embodiment, the blister packaging (1) comprises a blister sheet with at least one first cavity (2), a cover sheet (3) laid over and bonded to the blister sheet, wherein the at least one first cavity (2) comprises a poriferous support (4) coated with an
active agent, and, advantageously, a stabilizing cavity (10) reducing wobbling of the blister packaging (1) during the process of dissolving the
active agent, preferably, a V-shaped stabilizing cavity (10).