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If someone, let's say, went to the beach (at night of course) and got sand in his hair and it stayed in his hair, the next morning would it be considered a Hasisa (obstacle) for Tefilin?

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"at night of course"? But +1. – msh210 Aug 7 '13 at 17:51
@msh210 during the day there is most likely Perisut. – Hacham Gabriel Aug 7 '13 at 17:51
@HachamGabriel At least there isn't sakanat nefashot. – Double AA Aug 8 '13 at 8:44
@DoubleAA Perisut isn't Sakanot Nefashot? – Hacham Gabriel Aug 8 '13 at 14:03
Depends on the situation. But please never swim at a beach at night! – Double AA Aug 8 '13 at 21:22
up vote 2 down vote accepted

It is a Chatzitzah and must be cleaned. See Shulchan Aruch Horav 27:7 ("וה״ה בתפילין של ראש צריך ליזהר בדבר שלא יהא שום דבר חוצץ בין תפילין לשערו ועפר או כנה מתה נקרא חציצה").

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What if the person is a dust salesman? – Double AA Aug 11 '13 at 9:07
Next question: if one has a Hasisa must he don Tefilin again to be Yose? – Hacham Gabriel Aug 11 '13 at 14:00
I don't see why not. – Meir Zirkind Aug 11 '13 at 16:27

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