Angle’s class I molar relationship is that the mesiobuccal cusp of the upper first molar occludes in the mesiobuccal groove of the lower first molar

Andrew’s class I molar relationship is that the distal cusp of the upper first molar occludes with the mesial marginal ridge of the lower second molar

The American Association of Orthodontists recommends children have an orthodontic screening no later than age 7. By then, enough of the permanent teeth have emerged to identify potential problems. However, you shouldn’t wait until all the permanent teeth erupt in the mouth. Starting orthodontic treatment early in life offers many advantages. For example, while children are still growing, expansion devices can be used to modify the width of the palate, which can help teeth come in straighter. Such treatment is best done at an early age to maximize a patient’s orthodontic potential.

Many people undergo orthodontic treatment during adolescent and teen-age years, when most of the permanent teeth have come in and treatment can be most effective. About 3 million teen-agers in the United States and Canada wear braces, and millions more would benefit from treatment.

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Today i came across a patient training website Dentalwisdom

well i was impressed by the way of the presentation i saw , many dentist some time have to explaine to a patient every step they have to do to make it easy to them to understand how the treatment will go, and some of them use a patient education software with visual effects which i think it’s the best way to make everything simple and clear. This site offer a demo copy for 14 days ( i got one to try )  . Here is a movie from dental wisdom for orthodontics points