in English is:

fluoridation

Mutations

Soft:(no mutation)
Nasal:(no mutation)
Aspirate:(no mutation)

Use

y fflworeiddiad hwn
fy fflworeiddiad i
dy fflworeiddiad di
ei fflworeiddiad ef/o
ei fflworeiddiad hi
ein fflworeiddiad ni
eich fflworeiddiad chi
eu fflworeiddiad nhw/hwy
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