The oldest piece of chewing gum dates from about 9,000 years ago, during the Mesolithic Era. According to British archeologists, a tar-like material with tooth prints in it was discovered in Finland. It is believed that the gum came from birch bark tar which was used as an adhesive as well as gum. Another form of gum was pine resin, examples of which were found mostly in Scandinavia. Scientists believe that the Neanderthals used chewing gum not only to glue pots together but as an early form on dental hygeine, to relieve mouth ailments such as cavities infections.