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.
To repair a cracked tooth, a dentist will have to assess the damage so she can determine which type of treatment is best. Crowns may be very helpful for teeth that have major cracks because they can normally prevent the cracks from spreading.