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Vivera also selling prices its retainers in sets of 4, which raises the value. Dr. Pinto says that”In my apply, we use Invisalign’s Vivera retainers. I like that they give you four sets, so you have got backups For a long time.”ควบคุมตำแหน่งฟันได้ทุกมิติ เพราะครอบคลุ�