Not really. Tooth decay does not 'travel' per se. However, the bacteria that cause decay are in greater concentration on a tooth that is next to a tooth experiencing decay. Therefore, you will frequently see decay between two teeth that touch affecting both teeth.
Yes. Most often this is seen interproximally...Between the teeth. It is never wise to leave cavities untreated, as this can lead to any unhealthy oral environment even with good home care. Treat the decay and then practice good preventive measures at home and by seeing your dentist regularly.
FREQUENT FLY R . Bacteria and poor oral hygiene cause cavities so if one tooth has decay than others are susceptible also.
??? Please explain what you mean by "replenish tooth decay." there are lots of ways to manage decay in adults. If you mean "recurrent" decay around old restorations, talk to your dentist about diet control, flossing. Fluoride rinses and treatments, anti-microbial rinses, and many other approaches. Read more...