Billy-bob teeth are an inexpensive novelty item sold in supermarkets, gas stations, and hobby outlets. They are designed to resemble the teeth of a stereotypical redneck for humorous effect, containing exaggerated gaps between teeth and having a slightly yellow discoloration. The plastic they are made from is pliable and shapes itself in the pattern of the teeth of the first person who wears them, making it difficult for multiple people to use the same set. They are primarily for use along the upper row of teeth.

Billy-bob teeth come in a variety of styles, such as one for women called Betty-bob teeth. Even more crooked and discolored sets have been marketed as caveman teeth, and Billy-bob gums are (as their name suggests) a toothless variety of the same product which sometimes contain fake piercings.