Brushing your teeth in space is one of those things that make you smile and think together. It is a tiny, intimate, automatic gesture. This is what we do while still half asleep, in front of the mirror, before starting the day. In orbit, however, that same gesture completely changes shape and meaning. It becomes attention, slowness, pure physics. It becomes an exercise in adaptation, like so many other things about life away from Earth.
Living with weightlessness
On board the International Space Station nothing follows the rules we know. The body changes, fluids shift, muscles thin, vision can get worse. Emotions also behave differently. The tears remain still in the eyes, collected in small shiny spheres that burn instead of falling. In this context, personal hygiene takes on a new, more delicate and more conscious value.
In 2013 Chris Hadfield, commander of Expedition 35, decided to tell this everyday life with a simple and direct video.
A slow and precise choreography
On Earth, water flows, falls, disappears down the drain. In space the water remains. It floats. It only moves if someone guides it. Astronauts use a special bag from which they squeeze a tiny amount of liquid. The water flows out and immediately takes the shape of an unstable bubble, held together by surface tension. It remains attached to the straw, waiting.
The toothbrush intercepts that sphere with a careful movement. The bristles capture the water, the toothpaste does the rest. The instruments are surprisingly normal. Common toothbrushes, common toothpaste, often shared between crew members as happens in a house full of roommates. The real difference comes at the end.
There is no sink or drain: the foam stays in the mouth. The most practical solution becomes swallowing the toothpaste, which is formulated to be edible. A final sip of water is used to rinse. That too is swallowed. The toothbrush returns to its place, ready for the next time.
This same experience was also told by Samantha Cristoforetti in a video released by ESA in 2020. A very human detail emerges in her explanation. Swallowing toothpaste doesn’t work for everyone.
Brushing your teeth in space tells much more than a technical curiosity: it tells how even the most banal habits change value when the context changes. In orbit, every gesture becomes intentional. Taking care of yourself also requires presence, patience and respect for the environment in which you find yourself.
It’s the same logic that turns a cup of coffee into a small engineering project and a bubble of water into a precious object. Life among the stars also passes through here, from a toothbrush, from a suspended drop of water, from a routine that continues to exist in new forms.
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