noun
row of teeth; set of teeth; dentition
Refers to the arrangement or alignment of teeth, often in the context of dental aesthetics or health.
彼女は歯並びがきれいだ。
She has a beautiful set of teeth.
歯並びを矯正するために矯正歯科に
I'm going to an orthodontist to correct my teeth alignment.
歯列 is a more technical term for dental arch or row of teeth, often used in medical contexts, while 歯並び is the common word for teeth alignment.
Compound of 歯 (ha, 'tooth') and 並び (narabi, 'line' or 'arrangement'), the continuative form of 並ぶ (narabu, 'to line up').