Spearmint Certs from Cadbury Adams. With Retsyn Crystals, you get the fresh breath you need in a low calorie mint. Containing only 4 calories per mint and loads of minty freshness, Spearmint Certs are a must have. You get two 12 count boxes for a total of 24 rolls of Spearmint Certs. People around the country have been enjoying Certs since 1956.