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Types Of Teet h
.
I nci sor Mol arCani ne Pr emol a
r
Funct i ons of Teet h
Why do we
have
di f f er ent
t ypes of
t eet h?
What i s
t hei r
pur pose?
Cani ne
Mol ar s
Pr emol ar s
I nci sor s
Wi sdom Teet h
Inci sors
How many?
Humans have 8 i nci sor s
al t oget her ; 4 i n t he upper
j aw and 4 i n t he l ower
j aw.
Shape
I nci sor s ar e shovel -
shaped.
Funct i on:
Used f or bi t i ng and
cut t i ng f ood.
Cani nes
How many?
Humans have 4 cani ne
t eet h, one i n each quar t er
of t he mout h, on ei t her
si de of t he i nci sor s.
Shape
Cani nes ar e poi nt y.
Funct i on:
Used f or t ear i ng and
r i ppi ng f ood.
Premol ars
How many?
Humans have 8 pr emol ar s,
t wo i n each quar t er of t he
mout h. They ar e bet ween
t he cani ne t oot h and t he
mol ar s.
Shape
Smal l and f l at
Funct i on:
Hol di ng and cr ushi ng f ood.
Mol ars
How many?
Humans have 8 mol ar s, t wo
i n each quar t er of t he
mout h. They ar e at t he
back of t he mout h behi nd
t he pr emol ar s.
Shape
Lar ge and f l at
Funct i on:
Gr i ndi ng f ood
Wi sdom Teet h
How many?
Humans can have up t o 4 wi sdom
t eet h, al t hough not ever yone has
t hem. Ther e i s 1 i n each quar t er
of t he mout h behi nd t he mol ar s.
Shape
Lar ge and f l at ( t hey ar e j ust a
t hi r d mol ar )
Funct i on:
Does not have one now! Some
sci ent i st s t hi nk t hat human
ancest or s needed a t hi r d mol ar t o
hel p gr i nd down pl ant t i ssue f r om
t hi cker l eaves when humans st i l l
at e t hem. Si nce t he di et of
humans has changed we don’ t need
t hem.
As t he human di et changed our
mout hs have become smal l er . Thi s
i s t he r eason why many peopl e
have t hei r wi sdom t eet h ext r act ed
– t aken out – as t her e i s no r eal
r oom f or a wi sdom t oot h so i t
Teet h Types and
Funct i ons
L. O. To name t he t ypes of t eet h
and t hei r f unct i ons.
Model labelling
St ruct ure of t oot h
Di gest i ve syst em
Mout h , Oesophagus
• Mout h: Foodst uf f s ar e
mechani cal br oken down by
chewi ng; sal i va i s added
as a l ubr i cant
• Oesophagus: Channel
bet ween st omach and
mout h.
St omach
• St omach:   Wher e
chemi cal act i on
begi ns, pr ot ei ns ar e
br oken i nt o si mpl er
f or m, and pi eces of
f ood ar e r educed t o
l i qui d f or m. The
st omach cel l s makes
gast r i c j ui ces whi ch
mi x wi t h t he f ood.
The aci d i n t he
j ui ces al so ki l l s any
ger ms.
Li ver, Pancreas & Smal l
i nt est i ne
• Li ver:   The l i ver
pr oduces bi l e whi ch
i s st or ed i n t he  gal l
bl adder   and ent er s
t he smal l i nt est i ne
vi a t he  bi l e duct .
Bi l e hel ps t o di gest
f at s.
• Pancreas:   Pancr eas
pr ovi des pancr eat i c
j ui ce t o compl et el y
br eakdown
car bohydr at es and
f ur t her di gest f at s
and pr ot ei ns.
• Smal l Int est i ne:   An
Large i nt est i ne
• Large i nt est i ne:
Any undi gest ed
or non absor bed
f ood passes i nt o
t he l ar ge
i nt est i ne.
Excess wat er i s
absor bed and t he
r emai ni ng
undi gest ed f ood
i s conver t ed
i nt o f aeces. The
f aeces i s st or ed
i n t he r ect um
unt i l i t i s
excr et ed t hr ough

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Teeth & digestion

  • 1.
  • 2. Types Of Teet h . I nci sor Mol arCani ne Pr emol a r
  • 3. Funct i ons of Teet h Why do we have di f f er ent t ypes of t eet h? What i s t hei r pur pose? Cani ne Mol ar s Pr emol ar s I nci sor s Wi sdom Teet h
  • 4. Inci sors How many? Humans have 8 i nci sor s al t oget her ; 4 i n t he upper j aw and 4 i n t he l ower j aw. Shape I nci sor s ar e shovel - shaped. Funct i on: Used f or bi t i ng and cut t i ng f ood.
  • 5. Cani nes How many? Humans have 4 cani ne t eet h, one i n each quar t er of t he mout h, on ei t her si de of t he i nci sor s. Shape Cani nes ar e poi nt y. Funct i on: Used f or t ear i ng and r i ppi ng f ood.
  • 6. Premol ars How many? Humans have 8 pr emol ar s, t wo i n each quar t er of t he mout h. They ar e bet ween t he cani ne t oot h and t he mol ar s. Shape Smal l and f l at Funct i on: Hol di ng and cr ushi ng f ood.
  • 7. Mol ars How many? Humans have 8 mol ar s, t wo i n each quar t er of t he mout h. They ar e at t he back of t he mout h behi nd t he pr emol ar s. Shape Lar ge and f l at Funct i on: Gr i ndi ng f ood
  • 8. Wi sdom Teet h How many? Humans can have up t o 4 wi sdom t eet h, al t hough not ever yone has t hem. Ther e i s 1 i n each quar t er of t he mout h behi nd t he mol ar s. Shape Lar ge and f l at ( t hey ar e j ust a t hi r d mol ar ) Funct i on: Does not have one now! Some sci ent i st s t hi nk t hat human ancest or s needed a t hi r d mol ar t o hel p gr i nd down pl ant t i ssue f r om t hi cker l eaves when humans st i l l at e t hem. Si nce t he di et of humans has changed we don’ t need t hem. As t he human di et changed our mout hs have become smal l er . Thi s i s t he r eason why many peopl e have t hei r wi sdom t eet h ext r act ed – t aken out – as t her e i s no r eal r oom f or a wi sdom t oot h so i t
  • 9. Teet h Types and Funct i ons L. O. To name t he t ypes of t eet h and t hei r f unct i ons. Model labelling
  • 10. St ruct ure of t oot h
  • 11. Di gest i ve syst em
  • 12. Mout h , Oesophagus • Mout h: Foodst uf f s ar e mechani cal br oken down by chewi ng; sal i va i s added as a l ubr i cant • Oesophagus: Channel bet ween st omach and mout h.
  • 13. St omach • St omach:   Wher e chemi cal act i on begi ns, pr ot ei ns ar e br oken i nt o si mpl er f or m, and pi eces of f ood ar e r educed t o l i qui d f or m. The st omach cel l s makes gast r i c j ui ces whi ch mi x wi t h t he f ood. The aci d i n t he j ui ces al so ki l l s any ger ms.
  • 14. Li ver, Pancreas & Smal l i nt est i ne • Li ver:   The l i ver pr oduces bi l e whi ch i s st or ed i n t he  gal l bl adder   and ent er s t he smal l i nt est i ne vi a t he  bi l e duct . Bi l e hel ps t o di gest f at s. • Pancreas:   Pancr eas pr ovi des pancr eat i c j ui ce t o compl et el y br eakdown car bohydr at es and f ur t her di gest f at s and pr ot ei ns. • Smal l Int est i ne:   An
  • 15. Large i nt est i ne • Large i nt est i ne: Any undi gest ed or non absor bed f ood passes i nt o t he l ar ge i nt est i ne. Excess wat er i s absor bed and t he r emai ni ng undi gest ed f ood i s conver t ed i nt o f aeces. The f aeces i s st or ed i n t he r ect um unt i l i t i s excr et ed t hr ough