As for those which are disclosed, while controlling one which possesses the action inside the specified buccal cavity material at least to the dentistry region in order that it delivers, being the re-formation possible retainer for contacting with the surface of the tooth which it inserts and adjoins and to the aforementioned dentistry region, as for the aforementioned retainer, as it possesses one which includes the aforementioned material matrix at least, we have possessed be too large with 1st form and the aforementioned retainer the insertion possible 2nd form where aforementioned retainer is inserted in aforementioned dentistry region in the aforementioned dentistry region, at the same time aforementioned retainer 2ndForm, when the aforementioned retainer is a 1st form, as it is created by re-forming the aforementioned retainer, features that it has possessed the specified form which corresponds to the contour of the surface of the tooth of the aforementioned dentistry region.開示されているものは、所定の口腔内作用を有する少なくとも1つの材料を歯科部位へと制御しつつ送達するべく、前記歯科部位への挿入および隣接する歯の表面との接触のために再形成可能な保持装置であって、前記保持装置は、前記材料を含む少なくとも1つのマトリックスを有するとともに、前記保持装置を前記歯科部位に挿入するには大きすぎる第1の形状と前記保持装置を前記歯科部位に挿入可能な第2の形状とを有しており、かつ前記保持装置の第2の形状は、前記保持装置が第1の形状にあるときに前記保持装置を再形成することによって作り出されるとともに、前記歯科部位の歯の表面の輪郭に対応する所定の形状を有していることを特徴とする。