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.
Best Answer: Have you tried mouth wash? A good mouth wash should help clean the retainer better than brushing and will help kill the bacteria that causes bad breath. Or you could even try that new isoactive tooth paste. It is suppose to really be able to get into crevasses that you can't get to when brushing. And to other people answering... it is PERMANENT!