*The past 12-month average baseline spend is calculated for the time frame of 10/1/18 – 9/30/19. Promotional offer begins on 10/1/19 and expires on 12/31/19. All cases must be invoiced by your NDX lab of choice on or before 12/31/19. nSequence® cases do not count toward the monthly average. Eligible customers must be dentists with valid NPI numbers. If applicable, multiple dentists per location may participate and qualify. Customer Account must be in good standing with NDX to receive gift card award. All calculations are estimated and subject to verification upon campaign expiration. The Amazon.com gift cards will be awarded after January 1, 2020.