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The old and those who have a bad memory are often bewildered because they always forget whether they have taken the prescribed medicine or not. Concave-Convex uses a memory-based flexible material, which is convex at first. After pushing the pills out, the little convex subsides. It goes back to its original convex form in a day (24h). The patients would simply touch and feel the form of the package to judge whether they have already taken the medicine or not and know how many times they take in a day.