Here are some possible Welsh translations depending on the context:
* "Clwst o ddannedd" - This literally translates to "cluster of teeth" and is the most accurate translation.
* "Ddannedd blaen" - This translates to "front teeth" and could be used if the focus is on the location of the cluster.
* "Clystydd o ddannedd" - This translates to "bunch of teeth" and is a more informal option.
The best translation will depend on the specific context of your usage.