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The lower probability of future dental problems (and lower probability of pain) also means I can be more attentive.
FORBES: What Would Louis XIV Have Paid for a Sonicare?
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Slevin's lawsuit alleged he became malnourished, lost significant weight, developed bedsores, fungus and dental problems and was not aware of his situation or surroundings.
CNN: STORY HIGHLIGHTS
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The reasons are apparently that scars could open up in space, dental problems could cause serious complications, and body odour must be avoided in a confined spacecraft.
BBC: China's female astronaut quandary