Chúm môi lại và hóp má vào. Ấn và giữ điểm lõm. Mỉm cười và chỉnh lại vị trí ngón tay nếu cần thiết. Tiếp tục ấn 30 phút nữa, hoặc lâu hơn. Lặp lại hàng ngày.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
To start exercising your cheek muscles, make a face as though you just ate a lemon or something remarkably sour. Your lips should be in a slight pucker or pout and your cheeks should be partially sucked in. Your teeth should not be clenched together, as this can prevent you from sucking your cheeks in, but your lips do need to be closed.   Note - this method is a folk remedy. In other words, it's not supported by any sort of scientific evidence, but rather by vague, unverifiable, anecdotal evide