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Vivera also selling prices its retainers in sets of four, which raises the value. Dr. Pinto suggests that”In my practice, we use Invisalign’s Vivera retainers. I like that they give you four sets, so you may have backups For several years.”เข้าถึงข้อมูลสุขภาพและรู้ข่าวโปรโม