Of course it will clear it.
Yeast is most often caused by heavy metals and when you bind them and chelate them out of the body the immune system becomes stronger and fights the yeast on the tongue.
During DMSA your heavy metals will decrease and the body can fight the yeast. When the yeast returns in the break it is because heavy metals show up again from storage site.
Just my opinion here, I also have a white coated tongue which is sometimes pink and sometimes coated. Of course when it is coated I also have physical signs of heavy metal poisoning and I then keep on chelating.
ps: from where are you from ? I live also in central europa.