Nadia Czekajewski got braces on her teeth when she was 8. Now she's in third grade, turning 9, and ``she'll be done before she begins fourth grade,'' says her father, Tomasz Czekajewski.

``It was a wise decision to start young,'' says Czekajewski, of Chicago. ``Kids are not as self-conscious at this age.''

Braces used to be another miserable part of being a teenager, but now some kids start and finish orthodontic treatment long before adolescence.

Despite the allure of getting it over with young, starting early is not right for every child. Experts say it all depends on the treatment required.

Some children who start early end up in a second phase of treatment, with braces into the early teenage years, says Dr. Flavio Uribe of the University of Connecticut School of Dental Medicine in Farmington, Conn.

``That's one of the criticisms of early treatment: Kids in braces for a long time,'' Uribe says. ``It's controversial.''

For children with Class II malocclusion, commonly referred to as an overbite or buck teeth, ``there is no advantage to starting early,'' says Dr. William Proffit, a professor at the University of North Carolina's School of Dentistry in Chapel Hill.

That was the conclusion of ``three major, randomized clinical trials comparing the outcomes of treatment'' for younger versus older children, Proffit says.

``Early treatment is more costly both in terms of the amount of money you have to pay and the number of visits you make, and there is a greater burden of treatment with no benefit for most children.''

Proffit was the author of one of the three studies that looked at early treatment for Class II malocclusion, with the other two done by researchers at the University of Florida and in the United Kingdom.

He emphasizes that early treatment is beneficial for other conditions, such as a Class III malocclusion, commonly referred to as an underbite, where the lower jaw is too big or the upper jaw is too small.

``You're trying to change growth and your window of opportunity has run out by age 10. The ideal time to start would be as early as age 7,'' Proffit says.

The largest group of children getting orthodontic treatment in the U.S. are those with Class I malocclusion, with crowded teeth that are either crooked or protrude. For this group, Proffit says, ``early treatment works, but you have to do two phases of treatment. So they're going to be in treatment for four years -- a first phase, then a vacation, and a second phase.''

There's one overarching reason to start early no matter what type of treatment the child will need, and that's when teeth are so crooked or unattractive that ``the child is really being teased and harassed and has psychosocial problems,'' he says. ``Most preadolescent kids shrug it off, but some kids are really bothered by it.''

The American Association of Orthodontists says most treatment begins between ages 9 and 14, but there are no detailed statistics on preadolescents versus teenagers.

The AAO also says most orthodontic treatment lasts from one to three years, with two years being the average, but it had no statistics correlating length of treatment with age at which treatment began.

The AAO recommends having children screened no later than age 7 to assess the best age for treatment.

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