Vivera also price ranges its retainers in sets of 4, which raises the cost. Dr. Pinto states that”In my exercise, we use Invisalign’s Vivera retainers. I like that they give you 4 sets, so you've backups For some time.”คำถามที่พบบ่อยเกี่ยวกับการใส่รีเทนเนอร์Clear re