Hi..
Thanks for the query..
I have gone through your query and can understand your concern...
As per your complain bitter taste in mouth can be due to infection in teeth or gums,
sinus infection, upper
respiratory tract infection,
acid reflux, side effects of medicines, allergies,
hormonal changes, toxin exposure etc..
In case if it is occurring after taking any specific tea then it can be due to either expired products or some other ingredients in it..
So my suggestion is to consult an Oral Physician and get her evaluated and a thorough clinical evaluation will be done to rule out the cause and can be treated accordingly..
When the underlying cause will be treated the symptoms will subside on their own..
As of now you can gargle with flavoured antiseptic mouthwash..
Chew flavoured sugarfree chewing gum..
Drink plenty of water and do warm saline gargles..
Hope this information helps..
Thanks and regards..
Dr.Honey Nandwani Arora..