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.
Plaque busters: How olive oil, chewing gum and green tea can prevent the build-up of bacteria. A new toothpaste claims to 'dissolve' 88 per cent more dental plaque than other toothpastes. It is quite a claim, given that dentists advise patients to have bacterial plaque removed professionally from their teeth every three to six months.