noun
row of teeth; set of teeth; dentition
Refers to the alignment or arrangement of teeth, often used when describing whether teeth are straight or crooked.
彼女は歯並がきれいだ。
She has a beautiful set of teeth.
歯並が悪いと、虫歯になりやすい。
If your teeth are crooked, you're more prone to cavities.
Compound of 歯 (ha, 'tooth') and 並み (nami, 'line' or 'row'), referring to the arrangement of teeth.