Italians live by the rule of 15: 1  Use coffee beans within 15 days of roasting. 2  Use ground coffee within 15 minutes of grinding. 3  Drink coffee within 15 seconds of brewing.
The good news is that teeth (and bones) are able to heal themselves in a process called remineralization. Basically, specialized cells in the center of the tooth are able to regenerate dentin, the layer of tooth just under the enamel, and the enamel can then properly remineralize from the outside.
As soon as the tooth is extracted the bone will begin to shrink. You can not stop this from happening. For some it happens faster than others, but for most it only takes a couple of months to lose a lot of bone. Generally you can not see the bone loss because it happens under the gum.