ukubungwa   9  class 9
singular: uku-
  
1. caries, 2. decay (of teeth) (from kubungwa)
 ukubungwa : Prefixless Present 2. pers. sing. with 1.class 2.pers. sg. object of:
kubūngwa (-būnzwe)     v    1. to be wormy, 2. to have weevils
caries    ukubungwa, ukubora kw'amenyo
En-En dictionary 
tooth decay   ukubungwa, ukubora kw'amenyo
En-En dictionary