### body part | tissue | bone | tooth:

Incisor tooth
* Incisor teeth are the teeth at the front of the mouth
  - have sides
* Most incisor teeth have sides.
* Some incisor teeth form small tusks.

### body part | tissue | bone | tooth | incisor:

Rodent incisor
* Some rodent incisors have roots.
* are rootless , growing continuously.

Upper incisor
* Some upper incisors have roots.
* are absent in Ruminants.
* close just inside lower, i.e. reverse scissor bite.
* grow from the premaxilla, but other upper teeth grow from the maxilla.

Milk tooth
* Milk teeth appear after two weeks.
* Milk teeth are small and unspecialized, but permanent teeth are adapted for the animal's diet
  - very important as they maintain the space of the permanent teeth
  - stay in a child up to the age of seven to eight years
* Some milk teeth are part of children
  - kids
  - nippers
  - orphans
  - toddlers
  - tots
* are tooths.

### body part | tissue | bone | tooth:

Molar
* Most molars crush food.
* Most molars have ridges
  - rough surfaces
* Some molars have crests
  - sharp crests
  - shear crests
* Some molars retain basic patterns
* also have broad crowns withrounded cusps but are larger than premolars.
* are absent in milk teeth
  - behind premolars
  - big and blunt and therefore slow to push through
  - found towards the back of the mouth
  - further back and are relatively flat
  - located in mouths
  - of the crushing type
  - rooted and semi- hypsodont
* are the largest teeth found in the mouth and are located behind the premolars
  - most posterior teeth in the mouth
  - rearmost teeth in the mouth, used for grinding food prior to swallowing it
  - tooths
  - tritubercular with well developed talonids
* contain many pits and grooves.
* first appear as permanent teeth.
* grind food.
* have a flat surface used for grinding
  - at least two roots
  - grind surfaces
* help to grind the rough food before swallowing.
* includes bone cells
  - cell membranes
  - corpi
  - cytoplasm
  - enamel
  - ground substances
  - marrow
  - mast cells
  - nuclei
  - plasma membranes
  - pulp cavities
  - root canals
  - sections
  - tooth roots
  - vacuoles
* line both the upper and lower jaw, but incisors occur only on the lower jaw.
* normally have three to five cusps and two or three roots.
* perform functions.

Molar tooth
* Molar teeth are heavy and adapted for their role in crushing bone
* Most molar teeth grind food
  - have ridges

New tooth
* New teeth erupt at the back of the jaw and work forward.
* New teeth grow in at the back of the mouth as old ones disintegrate in the front of the jaw
  - the back of the mouth and move forward to replace old worn sets
  - to replace lost ones

Premolar
* are found distal to canines and mesial to molars
  - low wide teeth that are located behind the canines
* are the back teeth or cheek teeth closer to the front of the mouth than the molars
  - teeth with points, just behind the canine
  - tooths
* have a broad crown with rounded cusps but have only one root
  - more flat chewing surface because they're meant for crushing food
  - one, two, and sometimes three canals

Primary tooth
* Primary teeth are also very important for the child's self-esteem
  - at risk for decay soon after they erupt
  - necessary for chewing, speaking and appearance to boost a child's self-esteem
* Primary teeth hold the space for permanent teeth
  - in the jaw for the permanent teeth
  - play a major role in a child s physical and psychological development
  - provide cosmetics, phonetics, mechanical digestion and bone growth

Rotten tooth
* Rotten teeth are the most common health problem
  - can cause heart problems
* Some rotten teeth cause heart problems.