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I am now also using my left hand.
A great way to improve left hand coordination is to brush your teeth with your left hand as well (twice per day).

After 1 - 2 weeks you will notice a significant...

I have always used only my right hand.
It all comes down to finding the correct angle. I have to admit that I cannot use the exact same angles on my right and left hand side.
On the right hand side...