The present invention contains a dental liquid (21) that is at least partially improved in ease of use as compared to conventional packages and opens one edge when pressed and is dentally opened through the opened one edge. Provided is a synthetic resin package (2) containing at least one bag (14) from which a working liquid is allowed to flow out. The packaging body (2) has both side edges (4a, 4b) and a lower edge (6) closed over the whole, and the applicator insertion portion (10) and the bag body are located adjacent to each other in the lateral direction. Part (12) is defined, and the upper edge (8) corresponds to the applicator insertion part (10) although the part (8b) corresponding to the bag housing part (12) is at least partially closed. The site part (8a) to open is open released, and the bag body (14) is a form which is located in a bag body accommodating part (12) toward the one end edge opened downward.本発明は、従来の包装体に比べて使用勝手が少なくとも部分的に改良された、歯科用液体（２１）を収容し且つ押圧されると片端縁が開封されると共に開封された片端縁を通して歯科用液体が流出せしめられる少なくとも１個の袋体（１４）を含有した合成樹脂製包装体（２）を提供する。この包装体（２）は、両側縁（４ａ、４ｂ）及び下端縁（６）は全体に渡って閉じられていて、横方向に隣接して位置する塗布具挿入部（１０）と袋体収納部（１２）とが規定されており、上端縁（８）は袋体収納部（１２）に対応する部位（８ｂ）は少なくとも部分的に閉じられているが塗布具挿入部（１０）に対応する部位（８ａ）は開放されており、袋体（１４）は開封される片端縁を下方に向けて袋体収納部（１２）内に位置せしめられる形態である。
