Epidemiology
Bell's palsy is the most common aetiology of unilateral facial palsy among those aged 2 years and older. It is most prevalent in people aged 15-45 years.[3] The reported incidence is 23-32 cases per 100,000 per year.[3][13][14] It is equally distributed between both sexes and sides of the face. There is no substantial evidence that seasons or geographical locations affect the incidence. There is no evidence suggesting racial or ethnic preference toward developing Bell’s palsy. The incidence of Bell’s palsy is higher during pregnancy, with most cases arising in the third trimester or postnatal period. Pregnancy-associated Bell’s palsy is associated with a lower chance of recovery.[15][16] It has also been suggested that there might be a slight increase in Bell’s palsy incidence after dental procedures.[17]
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