Fresh concrete is perishable and will lose quality if it sits in the truck too long. ASTM C 94, Standard Specification for Ready Mixed Concrete, says that concrete should be discharged within 90 minutes and before 300 revolutions of the mixer after water has been added to the cement.
You can prevent cavities. Minerals in our saliva, such as calcium and phosphate, along with the protective fluoride that we can get from fluoride toothpaste or a fluoride rinse or in some cases from fluoridated tap water, can repair minerals and protect them from acid damage.
The prevention of tooth decay can be done through an apple a day. While fresh fruits do contain high sugar levels and can be sweet and acidic, they can stimulate saliva flow, says Reader's Digest. The extra saliva reduces cavities because it lowers levels of bacteria.