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The bio Father would have a case, if he can present the medical documentation that the overbites are so severe that if they wait to have them corrected it would be more damaging and thus more costly. He should be able to get this from the dentist he is going to, and, as well, get a second opinion because she will surely want to have another dentist evaluate the matter.
The argument that sports costs should not take precedence over the health and wellbeing of the children is a good one.
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