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If you are hurry to brush your teeth, its hard to clean thoroughly also it incurred increase wear of the teeth. The most important thing in brushing teeth is polish teeth carefully for 3 minutes. Take 3 minutes to brush teeth until a cup of sand in the sandglass falls down. Visually the sandglass represents that falling sand for 3 minutes to be able to brush your teeth which it called 'sandglass brush-cup'.
Dong-a Univ.
Busan, South Korea
Dong-A University
Busan, South Korea
Incheol Hwang
Dong-a Univ.
busan, South Korea
seungmin Lee
Dong-A univ.
Busan, South Korea
Hyunjin Ahn