I agree with the other expert about his ideas of treatment and causes. I would also like to leave/add my thoughts as I see you are offline.
Candidiasis (or thrush) is just an overgrowth of yeast in the mouth...quite common. It has many causes ranging from antibiotic usage, diabetes, asthma medications, over consumption of sugar, and several other causes such as stress, birth control pills, and having a dry mouth can all lead to oral thrush. It is not caused by a deficiency of any kind in the body but could represent a weakened immune system-and possibly your recent dental work. To avoid reoccurance, you would have to know the cause. For example, if it's due to antibiotic usage, there is nothing you can do besides not taking the antibiotics. Antibiotics kill both good and bad bacteria, and thus always the overgrowth of yeast but you stated that you are not taking antibiotics, so this does not apply to this particular case at this time. Some cases of oral thrush has no known cause. So, sometimes, it cannot be avoided.
Oral Nystatin is a prescription medication that is used for oral thrush and will usually clear up thrush within a few days and the medicine is very inexpensive. However, if you are looking for something 'natural', grapefruit seed extract (liquid form) has been shown to reduce fungal infections in the mouth. You use 10 drops of the liquid mixed with 10 drops of water and use a Q-tip to 'paint' the mouth. You can also use tea tree oil and coconut oil (liquid) to paint the mouth and tongue (with a Q-tip). Gentian Violet has been known to help with thrush also, but Australian researchers have shown that it could cause things like mouth cancer when used in larger amounts.
Here is a link to some all natural thrush treatments.... click here.
If all else fails, you might have to get the rx for Nystatin.
Hope this helps!