Orthodontist Serving Yarmouth, Portland, Windham, Gray and Gorham, MA
Adult and Pediatric Orthodontics – Offices in Yarmouth, Portland, Windham, Gray and Gorham, Massachusetts
Dr. Joanna J. Yu is a specialist in orthodontics for children and adults using clear braces, invisalign, and traditional orthodontic braces.

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Welcome to the website of Dr. Joanna J. Yu
Dr. Joanna J. Yu is a specialist in orthodontics for children and adults.
We offer silver braces, ceramic braces, clear braces and Invisalign invisible aligners.
Our services include braces for kids, braces for adults, adult orthodontics, dental braces, clear braces, Invisalign invisible aligners.
Dr. Joanna J. Yu serves the Yarmouth, Portland, Windham, Gray and Gorham, ME.
An orthodontist is a dentist with advanced education in orthodontics (the diagnosis, prevention and treatment of dental and facial irregularities). In addition to traditional metal braces, some orthodontists specialize in clear braces, gold braces, lingual braces, ceramic braces, Damon® braces, Invisalign® invisible aligners and adult braces.
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When is the best time to begin orthodontics?
Though an orthodontist can enhance a smile at any age, there is
an optimal time period to begin treatment. Beginning treatment at
this time ensures the greatest result and the least amount of time
and expense. The American Association of Orthodontists recommends
that the initial orthodontic evaluation should occur at the first
sign of orthodontic problems or no later than age 7. At this early
age, orthodontic treatment may not be necessary, but vigilant examination
can anticipate the most advantageous time to begin treatment.
What are the benefits of early orthodontic evaluation?
Early evaluation provides both timely detection of problems and
greater opportunity for more effective treatment. Prudent intervention
guides growth and development, preventing serious problems later.
When orthodontic intervention is not necessary, an orthodontist
can carefully monitor growth and development and begin treatment
when it is ideal.
Why is age 7 considered the optimal time for screening?
By the age of 7, the first adult molars erupt, establishing the
back bite. During this time, an orthodontist can evaluate front-to-back
and side-to-side tooth relationships. For example, the presence
of erupting incisors can indicate possible overbite, open bite,
crowding or gummy smiles. Timely screening increases the chances
for an incredible smile.
What is Phase I (interceptive) treatment?
Phase I treatment generally begins around age 7 when a child has
their full set of baby teeth and a few of the permanent front incisors
have already erupted. This interceptive treatment phase is important
for those with moderate to severe orthodontic problems, as it can
control the problem and often reduce the treatment time in braces
later or eliminate the problem completely.
What are the advantages of interceptive treatment?
Some of the most direct results of interceptive treatment are:
- Creating room for crowded, erupting teeth
- Creating facial symmetry through influencing jaw growth
- Reducing the risk of trauma to protruding front teeth
- Preserving space for unerupted teeth
- Reducing the need for tooth removal
- Reducing treatment time with braces
What is Phase II treatment?
Phase II treatment will come several years after Phase I treatment.
Phase II treatment is started once the child has more of his/her
permanent teeth, normally around the ages of 12 or 13. This final
treatment stage helps the child attain an ideal bite after all of
the permanent teeth have erupted.
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Portland Office
888 Brighton Avenue
Portland, ME 04102
Ph: 207-775-3456
Windham Office
744 Roosevelt Trail
Suite 101
Windham, ME 04062
Ph: 207-892-9909
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