No clinical evidence that mewing reshapes an adult's jawline

The number

When researchers went looking for evidence that mewing works, they found almost nothing to evaluate. A 2025 systematic review screened 10,370 papers and concluded that the literature on mewing's effects is sparse and low-quality. ^[2]

there is a paucity across the literature evaluating the efficacy of mewing in achieving significant aesthetic or functional changes, often relying on anecdotal or low-level evidence

^[2]

What it does and doesn't establish

What this establishes is an absence of evidence, not much more: no clinical trial shows that pressing your tongue against the roof of your mouth reshapes a jaw, and the studies that exist are anecdotal and low-level. It does not license the reverse manosphere claim — that an adult can resculpt finished facial bone for free. The real, narrow kernel behind mewing is about oral posture in growing children, not adult bone. And "no proven benefit" is not the same as "harmless": the American Association of Orthodontists warns that improper tongue pressure can cause tooth misalignment, bite problems and TMJ pain. ^[1]

Does mewing actually change your jawline?