Should there be

The margin where the crown meets the tooth should have no ledge. If not trimmed back and made smooth, harmful bacteria are harboured here, if not kept clean.

Bacteria can lead to decay and periodontal disease, so correct brushing at the gum line with daily flossing as described by the dental hygienist in your dental practice is important. 

Regular checkups are essential to identify any problems as early as possible to avoid expensive treatments later.