01

Ntau tus phooj ywg miv thiab dev tsis tau tsa los ntawm menyuam yaus, yog li kuv xav paub tias lawv muaj hnub nyoog li cas? Puas yog noj zaub mov rau kittens thiab menyuam dev? Los yog noj cov neeg laus dev thiab miv zaub mov? Txawm hais tias koj yuav ib tug tsiaj thaum yau, koj yuav xav paub tias tus tsiaj muaj hnub nyoog li cas. Puas yog 2 hli lossis 3 hli? Hauv tsev kho mob, peb feem ntau txiav txim siab lub hnub nyoog ntawm cov tsiaj los ntawm cov hniav.

Muaj qhov sib txawv tseem ceeb ntawm cov hniav vim yog cov khoom noj sib txawv thiab kev noj zaub mov txawv, kev siv cov hniav sib tsoo cov khoom ua si thiab khoom noj txom ncauj sib txawv, yog li feem ntau hais lus, cov hniav yuav raug raug rau cov menyuam dev thiab cov miv, thaum qhov sib txawv yuav loj heev rau cov neeg laus. dev. Ntawm chav kawm, lub thiaj li hu ua deviation kuj yog nruab nrab. Tus dev 5 xyoos ib txwm noj cov pob txha, thiab cov hniav hnav zoo ib yam li tus dev 10 xyoo. Tab sis koj tsis tuaj yeem ntsib tus dev 10 xyoo uas muaj cov hniav tib yam li tus dev 5 xyoos. Ua ntej, kuv tau ntsib tus tswv tsiaj uas coj cov plaub hau kub hu ua 17 xyoo. Qhov ntawd yog ib qho zoo heev. Nws yuav tsum tau txiav txim siab txog hnub nyoog thiab lub cev mob ua ntej nws tuaj yeem kho. Kwv yees li 7 xyoo thaum koj qhib koj lub qhov ncauj kom pom cov hniav. Puas yog nws nco txog hnub nyoog ntawm nws niam tais yawm txiv?

Tau kawg, thaum koj tseem hluas, koj tuaj yeem paub ntau yam kab mob ntawm cov tsiaj los ntawm kev soj ntsuam lawv cov hniav, xws li seb lawv tsis muaj calcium thiab muaj ob kab ntawm cov hniav. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tau kawm saib xyuas kev loj hlob ntawm cov hniav thiab txiav txim lawv lub hnub nyoog thiab kev noj qab haus huv.

02

Tus dev pib loj hlob cov hniav deciduous 19-20 hnub tom qab yug me nyuam; Thaum muaj hnub nyoog 4-5 lub lis piam, thawj thiab thib ob lub mis incisors yog tib qhov ntev (incisors); Thaum 5-6 lub lis piam, qhov thib peb incisor yog txawm; Rau cov menyuam dev muaj 8 lub lis piam, cov deciduous incisors tau loj hlob tag nrho, thiab cov hniav deciduous yog dawb thiab nyias thiab ntse;

Thaum lub sij hawm 2-4 lub hlis yug, cov menyuam dev pib maj mam hloov cov hniav deciduous, thiab thawj incisor pib poob tawm thiab loj hlob tshiab incisors; Qhov thib ob thiab thib peb incisors thiab canines yog hloov thaum muaj hnub nyoog 5-6 lub hlis; Thaum muaj hnub nyoog 8 hli mus rau 12 lub hlis, tag nrho cov molars raug hloov nrog cov hniav mus tas li (cov hniav tas mus li). Cov hniav mus tas li yog xim dawb thiab ci, thiab cov incisors muaj ntse protrusions. Yog hais tias muaj daj, nws txhais tau hais tias muaj tartar;

Thaum tus dev muaj hnub nyoog 1.5-2 xyoos, lub ncov loj ntawm thawj mandibular incisor (incisor) yog hnav tawm, thiab ntws nrog lub ncov me me, uas yog hu ua ncov hnav tawm; Thaum muaj hnub nyoog 2.5 xyoo, lub cusp ntawm lub mandibular incisor thib ob (nruab nrab hniav) tau hnav tawm; Thaum muaj hnub nyoog 3.5, lub ncov ntawm lub maxillary incisor tau hnav tawm; Thaum lub hnub nyoog ntawm 4.5, lub cusp ntawm nruab nrab maxillary hniav tau hnav tawm; Qhov no yog qhov kawg ntawm tus dev cov hluas. Cov hniav hloov thaum lub sijhawm no tsis tshua muaj kev cuam tshuam los ntawm lub hnub nyoog tshaj li qhov khoom noj, yog li lawv maj mam ua tsis raug.

Txij li thaum tus dev muaj 5 xyoos, qhov thib peb incisor ntawm lub hauv pliaj hauv pliaj thiab lub cusp canine tau hnav me ntsis (tsis flattened), thiab thawj thiab thib ob incisors yog rectangular; Thaum muaj hnub nyoog 6 xyoo, lub cusp ntawm lub thib peb maxillary incisor tau hnav me ntsis, thiab cov hniav canine tau blunt thiab puag ncig; Thaum muaj hnub nyoog 7 xyoo, mandibular incisors ntawm cov dev loj tau hnav rau hauv paus, thiab qhov sib tsoo nto yog ntsug oval; Thaum muaj hnub nyoog 8 xyoo, mandibular incisors ntawm cov dev loj yog hnav thiab inclined rau pem hauv ntej; Thaum muaj hnub nyoog 10 xyoo, hnav nto ntawm mandibular thib ob incisor thiab maxillary incisor yog longitudinal ellipse; Cov dev loj feem ntau nyob rau 10-12 xyoo, thiab tsis tshua muaj cov hniav ntog, uas feem ntau yog hnyav hnyav;

Thaum tus dev me muaj 16 xyoo, nws muaj lub neej ntev, lossis nws yog tus dev qub qub. Cov incisors poob tawm, cov hniav canine tsis tiav, thiab feem ntau yog cov hniav daj tsis sib xws; Thaum muaj hnub nyoog 20 xyoo, cov hniav tuaj yeem poob, thiab yuav luag tsis muaj cov hniav hauv qhov ncauj.

03

Piv nrog rau cov dev feem ntau gnawing tej yam nyuaj rau zom lawv cov hniav, uas ua rau nws nyuaj rau txiav txim hnub nyoog vim hniav hnav. Miv cov hniav loj hlob tsis tu ncua thiab yuav luag siv los ua tus qauv zoo tshaj plaws los txiav txim hnub nyoog.

Lub canine hniav ntawm miv yog qhov ntev, muaj zog thiab ntse. Cov hniav canine muaj cov hauv paus hniav thiab cov hniav. Thaum lub qhov ncauj kab noj hniav raug kaw, lub Upper canine cov hniav yog nyob rau ntawm lub posterolateral sab ntawm cov hniav hauv qab. Muaj qhov sib txawv tom qab tus hniav canine. Thawj premolar yog qhov me me, qhov thib ob premolar kuj loj, thiab qhov thib peb premolar yog qhov loj tshaj. Lub sab sauv thiab qis premolars yog tag nrho ntawm plaub cov lus qhia. Cov hniav nruab nrab yog qhov loj, ntse, thiab muaj cov nyhuv ntawm tearing nqaij, yog li nws tseem hu ua cov hniav sib cais.

Tus miv loj hlob nws thawj lub mis incisor 2-3 lub lis piam tom qab yug me nyuam; Qhov thib ob thiab thib peb incisors thiab canines yog tsim nyob ib ncig ntawm 3-4;

Miv loj hlob thawj zaug thiab thib ob incisors los hloov lub mis incisors ntawm txog 3.5-4 lub hlis; Thaum muaj hnub nyoog 4-4.5 lub hlis, qhov thib peb incisor loj hlob los hloov lub mis incisor; Canine hniav loj hlob nyob rau hauv li 5 lub hlis los hloov tus me nyuam canine hniav;

Tus miv hlob cov hniav premolar txog 2 lub hlis; Qhov thib ob thiab thib peb deciduous premolars loj hlob ntawm 4-6 lub hlis, thiab maj mam hloov nrog cov premolars mus tas li; Thawj cov molar loj hlob ntawm 4-5 lub hlis. Lub hnub nyoog hloov hniav tseem ceeb ntawm cov miv yog li 4-6 lub hlis. Thaum lub sij hawm no, lawv yuav poob qab los vim mob hniav.

Tom qab tus miv muaj 1 xyoos, nws cov incisors qis pib hnav; Tom qab muaj hnub nyoog 7 xyoo, tus miv cov hniav pib maj mam, thiab cov mandibular incisors tau hloov pauv; Tom qab hnub nyoog 10 xyoo, cov hniav hauv pem hauv ntej ntawm tus miv lub puab tsaig sab sauv yuav poob, yog li koj tuaj yeem kho koj cov zaub mov raws li kev hloov pauv ntawm te.