Bríd Mhór wrote:
There would be many ways of saying this correctly.
I suggest -
Maolaíonn cleachtadh na mothúcháin.Wait for more input (three to agree), and probably spelling correction. 
Isn’t that a bit ambiguous? I first read it as ‘practicing feelings dulls …’, expecting something more in the phrase. Adding an article would avoid this:
maolaíonn an cleachtadh na mothucháin.
And could you use
na céadfaí instead of
na mothúcháin? The latter sounds too much like only emotional feelings, rather than the senses in a more general way …