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    Let 5/5 represents the total number of dentists surveyed
          3/5 represents the dentists who recommend white toothpaste
      \frac{5}{5} -  \frac{3}{5}  =  \frac{2}{5}

 \frac{2}{5} is the fractional part of the dentists who do not recommend white tootpaste.

Convert fraction to percent:
      \frac{2}{5} = 0.4   or  40%

ANSWER:  40% do not recommend white toothpaste.

If 3 out of 5 dentists recommend white tooth-paste, then 2 dentists do not recommend white toothpaste.

So, if 5 is increased to 100 (i.e. 5*20), 2 will be increased to 2*20 = 40

So, if 100 dentists are there, 40 dentists do not recommend white toothpaste.

Thus, 40% dentists do not recommend white-toothpaste.