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The idea comes from our reality .Brushing teeth is
an essential process in our life.It will do harm to our
oral cavity to use tumbler which can cause a great
deal of bacteria for a long time
It is hard to clear the tumbler which has the square
straight bottom,so we change it into "U shape".
From now on,that you wash the tumbler is as same
as wash the bowls.What we do is just to help you
for your healthy oral cavity
Zhou Peng He Yu