Hello again and thank you for your response,
There is a possibility that you have thrush, a yeast infection of the mouth. It is characterized by a thin white film that covers the oral tissues. It's not necessarily painful.
It is most common in babies, children, and the elderly; it can also effect people suffering from diabetics, women on birth control pills, or those with a weakened immunity or those, who take antibiotic In all of these cases, the healthy balance of bacteria in the mouth can be disrupted, making it easier for Candida albicans to grow and spread.
You can read more about thrush here:
If this is the case, your dentist can give you some antifungal medications to get rid of this condition.
Other conditions that can also cause a white tongue are:
Leukoplakia - white tongue or mouth lining.
Mechanical trauma to tongue
Oral lichen planus
Oral thrush - white patches on tongue
Systemic Lupus Erythematosus etc.
You can also refer to the following link for more information:
I would suggest you to visit an oral surgeon or an oral physician and get it biopsied to confirm what it is. A visit to a nearby dental school will be beneficial.