What has teeth but cannot bite?

This clever riddle plays on our understanding of words, particularly the multiple meanings of "teeth." While we typically associate teeth with an animal's mouth and its ability to chew or bite, many everyday objects also possess structures that share a similar appearance or function. In this case, the answer lies in a common grooming tool that helps us manage our hair.

A comb, with its row of narrow projections, perfectly fits the description. These projections are indeed called "teeth" because they resemble the pointed structures found in the mouths of living creatures. However, unlike a shark or a dog, a comb is an inanimate object, utterly incapable of biting or causing harm in that way. Its "teeth" are designed for detangling, styling, and smoothing hair, performing a very different kind of work than the teeth used for eating.

Combs have a remarkably long history, with archaeological evidence suggesting their use dates back tens of thousands of years. Early combs were crafted from materials readily available to ancient peoples, such as bone, wood, and even ivory. Over time, as societies advanced, so did the materials and designs of combs, leading to the diverse range we see today, from plastic and metal to more ornate decorative pieces. They've been essential tools for personal hygiene and adornment across countless cultures, reflecting changing hairstyles and social customs throughout history.