The teeth are made of plastic and do not require batteries.
They are made from soft, flexible plastic and are designed to fit over your own teeth, allowing a molded, comfortable fit.
Descriptions say you can mold a fit by heating Friendly Plastic pellets in hot water, pressing the melted plastic into the teeth, then fitting them over your own teeth. Some product descriptions also state the teeth can be reused.
Product details list horror, zombie, and vampire themes. Listings also note they’re suitable for trick-or-treating, haunted houses, and other costume events.