14. Tobacco!&!Alcohol!
! Tobacco when kept in
! Scien7sts!are!not!sure!
mouth leaches out
whether!alcohol!directly!
carcinogens, which
damages!DNA,!but!they!
act on oral mucosa
have!shown!that!
causing neoplastic
alcohol!increases!
changes.
penetra7on!of!many!
! Habit of smoking is
DNAJdamaging!
also equally
dangerous.
chemicals!into!cells!!
!
20. Precancerous)lesions)!
!
• 1.Oral leucoplakia
• It is characterized by
white patch on the
buccal mucosa or any
place in the mouth and
is adjacent to the place
where the tobacco quid
is kept. The less likely
place is floor of the
mouth and tongue
although 93% of
leucoplakia at this
sites turn malignant!
23. 3.Oral sub mucous fibrosis!
• This condition is
characterized by limited
opening of mouth and
burning sensation on
eating of spicy food.
This is a progressive
lesion in which the
opening of the mouth
becomes progressively
limited, and later on
even normal eating
becomes difficult.
69. Ventral surface of the tongue and
floor of the mouth
• Then!examine!the!ventral!
surface.!Palpate!the!tongue!
to!detect!growths.!
• With!the!tongue!s7ll!
elevated,!inspect!the!floor!of!
the!mouth!for!changes!in!
color,!texture,!swellings,!or!
other!surface!abnormali7es.!