Thaum kwv yees li 5 lub lis piam cev xeeb tub, thawj cov hniav ntawm cov hniav tshwm sim hauv tus menyuam lub puab tsaig. Thaum yug los, tus me nyuam muajtag nrho ntawm 20 tus hniav thawj (10 lub puab tsaig sab sauv, 10 lub puab tsaig qis) muab zais hauv qab cov pos hniav. Cov hniav tseem ceeb kuj hu ua cov hniav me me, cov hniav mis los yog cov hniav deciduous.
Vim li cas cov menyuam mos mos tsis muaj hniav?
Qhov ua rau cov hniav tsis paub. Tab sis lawv yuav muaj feem ntau tshwm sim hauv cov menyuam yaus uas muaj qee yam teeb meem kev noj qab haus huv uas cuam tshuam rau kev loj hlob. Qhov no suav nrog Sotos syndrome. Cov mob kuj tseem tuaj yeem txuas rau chondroectodermal dysplasia (Ellis-van Creveld syndrome), pachyonychia congenita, thiab Hallermann-Streiff syndrome.
Cov me nyuam puas muaj hniav thaum yug los?
Ntiaj teb cov hniav yog cov hniav uas twb yug los lawm. Lawv txawv ntawm cov hniav me nyuam mos, uas loj hlob hauv thawj 30 hnub tom qab yug me nyuam.
Puas yog tus menyuam yug tshiab muaj hniav?
Thaum tus menyuam mos feem ntau tau txais cov hniav thawj hli tom qab yug los, qee tus menyuam mos yug los muaj ib lossis ntau dua. Cov no hu ua natal teeth. Natal cov hniav yog qhov tsis tshua muaj, tshwm sim hauv kwv yees li 1 tawm ntawm txhua 2,000 yug. Nws tuaj yeem ua rau poob siab yog tias koj tus menyuam yug los nrog cov hniav.
Cov me nyuam yug los tsis muaj hniav?
Cov me nyuam yug los nrog lawv cov hniav feem ntau twb tsim nyob rau hauv lawv cov pos hniav. Cov hniav no feem ntau pib tawg los ntawm lawv cov pos hniav nto (los yog tawg) los ntawm rau lub hlis. Ob sab pem hauv ntej cov hniav (central incisors) tshwm sim ua ntej, tom qab ntawd yog plaub sab pem hauv ntej cov hniav (central thiab lateral incisors).
