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A tube of toothpaste is screwed into the bottom of the hollow plastic toothbrush frame, essentially keeping the toothbrush always filled. When the tube is squeezed, some of the toothpaste will be pushed through holes around the bristles. When the tube of toothpaste runs out, it is simply replaced. This fixes the problem of freefloating toothpaste and improves the accessibility of astronauts to brush their teeth.
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