大後曾 (Toā-āu-chan)是 (sī)飼奶 (chhī-leng)動物 (tōng-bu̍t)喙 (chhùi)呢 (nih)位置 (ūi-tì)上後壁 (siāng-āu-piah)佮 (kap)形態 (hêng-thāi)上複雜 (siāng-ho̍k-cha̍p)的 (ê)喙齒 (chhùi-khí)。佇 (Tī)飼奶動物，伊 (i)定 (tiāⁿ)被 (pī)用 (ēng)來 (lâi)研磨 (géng-boâ)食物 (chia̍h-mi̍h)。
大人 (Toā-lâng)總共 (chóng-kiōng)有 (ū)12起 (khí)大歐曾 (toā-au-chan)，分做 (hun-chò)4組 (cho͘)，等汫 (téng-chiáⁿ)，等卓 (téng-toh)，下汫 (ē-chiáⁿ)，佮會卓 (ē-toh)，每一且 (múi-chi̍t-cho͘)有3起，分佈 (hun-pò͘)佇喙腔 (chhùi-khiuⁿ)的上後壁。每一組 (Múi-chi̍t-cho͘)排 (pâi)第三个 (tē-saⁿ--ê) (上後壁) 彼期 (hit-ki)閣 (koh)號做 (hō-chò)智慧齒 (tì-hūi-khí)。伊上萬 (siāng-bān)法 (hoat)，欲 (beh)oah 20歲 (hoè)彼當陣仔 (hit-tang-chūn--á)才 (chiah)對 (tùi)齒岸 (khí-hoāⁿ)不出來 (puh--chhut-lâi)。人種 (Jîn-chéng)無仝 (bô-kâng)，發芽 (hoat-gê)的時間 (sî-kan)有精差 (cheng-chha)。
人類的大後曾有下跤 (ē-kha)這 (chit)幾種 (kúi-chióng):
Ē-ham chiàⁿ-pêng éng-kiú-khí, ùi koân-téng khoàⁿ--lo̍h-khì
