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Greater magic fang gives one natural weapon or unarmed strike of the subject a +1 per four caster levels (maximum +5) enhancement bonus on attack and Damage rolls. The spell can affect a slam attack, fist, bite, or other natural weapon. The spell does not change an unarmed strike's Damage from nonlethal Damage to lethal Damage. This bonus does not allow a natural weapon or unarmed strike to bypass Damage reduction aside from magic.
Alternatively, you may imbue all of the creature's natural Weapons with a +1 enhancement bonus (regardless of your caster level).
Greater Magic Fang can be made permanent with a Permanency spell.