How many days before?
A fresh cut is rarely at its best on day one; sharp transitions soften over a day or two. Two to three days before the wedding is the useful window.

A wedding day is not the day to try a new cut. A fresh cut settles in a day or two.
A fresh cut is rarely at its best on day one; sharp transitions soften over a day or two. Two to three days before the wedding is the useful window.
A trial removes the risk of surprises in photographs that will last, and lets product choice be tested in advance.
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