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Crows-feet and laugh-lines Similar to worry-lines, crows-feet can also be successfully treated with muscle relaxing substances. Fillers such as collagen can also be implemented here. Distinctions between substances with limited duration of effectiveness and permanent or long lasting effect can be made. Hyaluronic acid, which although has an effectiveness of limited duration, has the advantage of not producing the allergic reactions that can occur with collagen. In this case the otherwise previously necessary testing can be dispensed with and the planned treatment can be begun more quickly. 
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