When people get braces on their teeth, the reason is usually to improve appearance.
But scientists have found that having straight teeth improves our sense of balance and posture.
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People with 'overbites' or 'underbites', crowded teeth or wonky teeth - known to dentists and orthodontists under the general heading of malocclusions - are less steady on their feet, the researchers discovered.
The theory that a bad bite may affect the whole body was tested on ten physically active people. The Spanish researchers, in a paper in Neuroscience Letters, said: "A remarkable finding of the study was that dental occlusion significantly influenced the balance control of the subjects."