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.
Hydrogen Peroxide is a great mouthwash. It kills the bacteria in your mouth which the cause of bad breath. Also brightens your teeth a bit. I take a swig of 3%, swirl it around my mouth for a min or so, spit it out and wallah, breath is fresh.