How Common Are Crooked Bites? A Global Review

How common are misaligned bites, really? Most studies answer only for a single town, clinic, or country. This systematic review aimed higher, pooling prevalence data from 53 studies — drawn from an initial 2,977 — to estimate the worldwide distribution of malocclusion traits across both mixed (transitional) and permanent dentition.

By aggregating across populations, the authors could describe how often different types of malocclusion appear globally rather than in one isolated sample. That breadth is what turns scattered local figures into a meaningful picture of how prevalent crowded and misaligned teeth have become across modern populations.

This matters because scale reframes the problem. If malocclusion were rare, it might be dismissed as individual bad luck. A global review showing how widespread it is supports the project's core claim: that crowded teeth and receding jaws are not random genetic accidents but a common, population-wide signal of changing development — a sign that humanity really is losing its space.