If you are wondering whether millipedes bite, the short answer is no, not normally. Millipedes are not built to attack people. When they feel threatened, they are much more likely to curl up and release defensive secretions than try to bite.
That does not mean they are risk-free to handle. Some species can produce secretions that irritate skin or eyes, and a startled millipede may leave a mark on your hands. The real concern is defensive behaviour, not biting.
What millipedes do instead of biting
Millipedes are detritivores, feeding on decaying plant material and other organic matter rather than hunting prey. Their mouthparts are made for feeding on softened material in leaf litter and soil, not for biting people.
In normal conditions, a millipede is far more likely to retreat into the substrate or under cover than to use its mouth defensively. That is why they are usually described as slow, shy animals that prefer leaf litter, wood and hidden spaces.
For a broader introduction to day-to-day keeping, you may find our Millipede Behaviour, Biology & Handling Guide useful.
Why the topic matters
People usually ask about millipede bites because they want to know whether the animals are safe to keep and handle. The practical answer is that safe handling matters more than bite risk.
When disturbed, many millipedes curl into a coil. Some also release defensive secretions from glands along the body. These secretions vary by species and can irritate skin, stain surfaces or cause discomfort if they get into the eyes or mouth. If you want more detail, read Are Millipedes Poisonous or Venomous? and Why Do Some Millipedes Produce Defensive Secretions?.
If you handle millipedes, do so gently. Wash your hands afterwards, avoid touching your face, and be cautious if you have sensitive skin or cuts. If secretions get on the skin, wash the area with plenty of water and mild soap.
Useful context for keepers
Some millipedes stay hidden for long periods, and that is often normal. A species disappearing into the substrate for a while is not automatically a sign of a problem.
Species do vary, though, so it is best not to assume they all behave the same way. Some are more surface-active, while others are rarely seen. What matters is whether the animal is feeding, moving normally when conditions suit it, and maintaining good body condition.
If you are unsure whether behaviour is normal, comparison with the species' usual activity pattern is more useful than expecting it to stay visible.
For practical handling guidance, see How to Handle a Millipede Safely.
Bottom line: millipedes rarely bite
Millipedes do not normally bite people, and bites are not the main issue keepers need to manage. Defensive secretions, curling and handling stress are far more relevant. If you understand the animal's behaviour and handle it calmly, most concerns about millipede bites quickly disappear.
