Discount will be applied automatically at checkout to qualifying transactions which are completed between 12:00 pm EST on Monday, December 6, 2021 and 11:59 p.m. EST on Sunday, December 26, 2021. Discount is only applicable to cleaning crystals which are clearly marked as part of this ‘Buy More and Save Promotion’ when you buy at least 2 of the marked product. Must buy 2 or more of the same item to qualify. Other products which may be included in the order (either non-sale items or sale items that do not meet the minimum qualifying order quantity) will not be discounted. Discount will be taken off the promotional item list price. Discount is offered on any single qualifying purchase; separate transactions will not be consolidated to meet the 2 item minimum. Discounts are applicable solely to inventory offered for sale on shop.Invisalign.com, not through any other Align or third-party ecommerce site. Customer is responsible for paying sales tax and shipping and handling, as applicable. Offer may not be combined with any other sale, promotion, discount, code, coupon and/or offer. Discounts may not be sold or otherwise bartered. Discount is offered on inventory in stock and available for sale during the promotion; no rain checks or substitutions. Order quantities may be limited. Resale and export are prohibited. Refunds, if granted, will be limited to the discount price(s) actually paid. Discounts and products are subject to change, and other restrictions may apply. Please refer to the Terms of Sale for other terms and conditions applicable to your purchase of products on this site.