Stop rehearsing the bite
If the bird bites every time you ask for the same thing, the setup is too hard. Use more distance, a perch, a target, a smaller reward step, or a shorter session.
Updated
Bird behavior
A bite is usually the last message, not the first one.
Birds bite for space, fear, pain, overexcitement, cage guarding, hormones, or because biting has worked before. The goal is to change the moment before the bite.

If the bird bites every time you ask for the same thing, the setup is too hard. Use more distance, a perch, a target, a smaller reward step, or a shorter session.
Fast hands, fingers near the face, reaching over the head, or grabbing from inside the cage can push a nervous bird into biting. Slow down and let the bird approach the hand instead.
A cage can feel like the bird's safe place. Do not reach in and argue with the bird. Teach stationing, offer a perch at the door, and clean or change bowls when the bird is calmly elsewhere.
Some birds nip when play gets too wild, when they are on a shoulder too long, or when favorite-person energy gets intense. Step down, pause, and reward calm behavior before the bird tips over the edge.
Yelling, flicking, shaking, or forcing another step-up usually makes trust worse. After a bite, get safe, stay boring, and change the plan so the bird does not need that answer next time.
Pain, hormones, sleep loss, illness, egg trouble, or injury can change behavior fast. If the biting is new, intense, or paired with appetite, posture, droppings, or energy changes, call an avian vet.
Use supplies as structure, not shortcuts. The goal is to make calm choices easier for the bird.
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Gives short trust-building sessions a low, predictable place to happen.

Plain bird-safe chewing work gives busy beaks something useful to do.

Turns part of the meal into a simple job instead of a full bowl of boredom.

Keeps transport secure for adoption day, avian-vet visits, and emergencies.
Do not make a big dramatic reaction, but do not ignore the information. Get safe, then change the setup that caused the bite.
Not if biting keeps working. Birds learn from patterns, so the owner has to make the easier behavior pay better.
Usually no. Biting is communication, fear, overexcitement, guarding, pain, or a learned strategy. Treat it as information.