Yes — when it's made well. Tofu-style litter is safe for kittens, for seniors, for cats with sensitive lungs, and for the people scooping the box.
But "safe" is a word every bag prints, so here's what it should actually mean.
Start with what's in the bag
Plant fiber, a starch binder, and a little calcium carbonate — stone powder — to keep the pellet hard. That's the list.
How much stone powder is in there varies a lot from brand to brand, and it changes how well the tofu litter works. You can check yours at the kitchen counter with a three-minute test.
A litter touches your cat in three places
Her paws, her nose, and her mouth — because whatever lands on her coat goes in there when she licks her fur. Any honest answer about safety has to cover all three.
Her paws
Pellets are rounded and smooth. Nothing sharp, nothing that cakes on and dries between her toes.
This matters more than people expect for older cats with stiff joints or sore pads, and for any cat coming home from surgery — a fine, powdery litter is the first thing a vet tells you to keep away from a healing paw.
Her nose
Plant fiber doesn't break down into the fine mineral powder that hangs in the air over a box, so there's very little to breathe in and very little settling on her coat.
Her mouth
Every cat swallows a little of what she walks through, because every cat grooms. That is the argument for a litter made of plant fiber rather than something mined.
So, is it safe for cats to eat?
That's a whole different ballgame. Don't let your cat eat the litter, whatever the litter is made of. A grown cat usually won't — she digs, she covers, she walks away. Kittens are the ones to watch, because a kitten explores with her mouth and will try anything once.
And one more thing, because this one matters. A cat that keeps eating litter is telling you something. There's a name for it: pica. It can point to anemia or other health problems. So call your vet.
How should you store it?
Plant fiber is made from food, so it behaves like food. Left somewhere warm and humid, or sealed up damp, it can go moldy in the bag.
So keep the bag closed and keep it somewhere dry — a closet, not a garage floor or a spot under the sink where a pipe sweats. And don't top up a box that has gone soggy at the bottom. Empty it, dry the pan, start again.
General information, not veterinary advice.