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Vivera also charges its retainers in sets of four, which raises the cost. Dr. Pinto claims that”In my exercise, we use Invisalign’s Vivera retainers. I really like that they provide you four sets, so you might have backups for years.”ควบคุมตำแหน่งฟันได้ทุกมิติ เพราะครอบค�