As gobstoppers dissolve very slowly , they last a very long time in the mouth , which is a major factor in their enduring popularity with children .
Gobstoppers have been sold in traditional sweet shops for at least a century , often sold by weight from jars .
As gobstoppers dissolve very slowly , they last a very long time in the mouth , which is a major factor in Gobstoppers ' enduring popularity with children .
Gobstoppers have been sold in traditional sweet shops for at least a century , often sold by weight from jars .