牙，又叫齒，或牙齒，係喺有脊椎動物嘅顎骨上面嘅結構。
牙質地好堅硬，唔同物種嘅牙有唔同形狀、功能。喺同一物種，唔同形狀嘅牙有各種嘅用途。用途包括撕開、磨爛嘢食。某啲物種，特別係食肉動物，用牙嚟打交、格抖。有啲物種，據演化論講，用牙嚟吸引異性。
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Hikari Hanazono has always been second to Kei Takishima. When they were six years old, their pro-wrestling loving fathers introduced them to each other. Assuming that she was the best in wrestling, young Hikari challenged Kei to a wrestling match only to be thoroughly defeated by him. Ever since that fateful incident, Hikari swore to beat Kei in school grades, sporting events or any competition.
Habibi
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