Hi welcome health care magic forum,
Gromet or tube or ventilation tube is inserted in children for serous ottits media .
One time insertion of the tube may deform the tympanic membrane/drum.
14 times tube insertion definitely may cause scaring and retraction pocket.
Retraction pocket leads to middle ear infection
and may also damage the hearing .
In my opinion before putting hearing aid you must get rid of ear infection.
Alternatively you can use a Bone Anchored Hearing AID
(BAHA) temporarily to improve hearing.
I would suggest you should see an ENT specialist
for thorough examination and otoscopic examination. You can undergo a pure tone audiometry
and CT Scan- temporal bone
to know the condition of ossicles.