Facial tics are repetitive, brief, irregular twitches of the facial muscles. They are very varied, but the most usual ones are facial grimacing, eye blinking, nose wrinkling, mouth twitches, squinting along with grunting and throat clearing. Those tics are usually symptomatic of nervous disorders such as Tourette syndrome. They usually occur during childhood and often disappear within some weeks, even though some can last much longer.

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