Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.
As per your complain yes, dry mouth
can be a symptom of Hyperthyroidism
even when it is being treated, however it can be due to a number of other common causes like:
-Side effects of medications if you take any.
supplying salivary glands.
-Oral infections like thrush.
-Sjogren's Syndrome, etc.
-For dry mouth chew sugar-free chewing gums.
-Drink plenty of water.
-Avoid regular mouthwash and use specialized mouthwash that are formulated for dry mouth patients like Biotene.
-You can also instil artificial saliva drops.
-Suck tart candies as it also stimulates saliva flow.
If does not improve consult her Physician and get evaluated.
Hope I have answered your query. Let me know if I can assist you further.