Jaw Shrinks With Age, 40-Year Study Finds11/09/11
WEDNESDAY, Nov. 9 (HealthDay News) -- The human jaw shrinks with
age and that can result in crowded front teeth among the elderly, a
new study has found.
Swedish researchers looked at plaster molds made of the jaws of
dental students in 1949 when the students were in their 20s, and
follow-up jaw molds of the same people made in 1959 and 1989.
"We found that over these 40 years there was less and less room for teeth in the jaw," Lars Bondemark, a professor of orthodontics at Malmo University, said in a university news release.
This reduced amount of space for front teeth was the result of a
few millimeters of shrinkage in both the length and width of the
jaws, primarily the lower jaw.
The amount of jaw shrinkage varies between individuals and is
influenced by hereditary and anatomical factors. In some cases, the
changes are significant enough that people notice a change in their
"In that case it's good to know that this is normal," Bondemark said.
Dentists need to consider the continuous shrinkage of jaws when
they plan major work on a patient's bite.
"We're working against nature, and it's hard to construct something that is completely stable," Bondemark said.
And, he added, "We can also eliminate wisdom teeth as the cause,
because even people who have no wisdom teeth have crowded front
The U.S. National Institute on Aging offers advice about
taking care of your teeth and mouth.
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