There are some studies which have shown that it can take up to two years for nerves to recover in the forehead.
It's important to find out if there are any treatable causes. For example was there a suture (stitch) placed or a device that may be compressing the nerve? Other than that there is no intervention of which I am aware that can repair these nerves as they are of extremely small caliber.
The tingling may be indicative of nerve recovery but only time will tell.

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