1 Either an acute injury near the nail or anything that causes the nail to be damaged repetitively (such as playing soccer) can also cause an ingrown nail.  If a member of your family has an ingrown toenail, then you are more likely to develop one, too.
The troy ounce (symbol and abbreviation: ozt) is a non-SI unit of mass commonly used to gauge the weight of precious metals. One troy ounce (ozt) = 31.1034768 grams (g) = 1.09714286 ounces (oz) = 480 grains (gr).
One troy ounce (abbreviated t oz or oz t) is equal to 31.103 4768 grams, (or about 1.0971 oz. avoirdupois, the avoirdupois ounce being the most common definition of an ounce in the US). There are only 12 troy ounces per troy pound, rather than the 16 ounces per pound found in the more common avoirdupois system.