어금니:위2(좌)+2(우)=4,아래2+2=4개:도합8개.송곳니:위2,아래2=4개소구치의수:2+2,2+2=8개.앞니:위4+아래4=8개.앞니(8)+송곳니(4)+소구치(8)+어금니(8)=28개.
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