I wouldnt consider it bad practise .... I don't soak off unless i have too or the client wants me too....whats the point..? if they look ok, well adhered and just need infilling then why soak it off and possibly cause more trauma to the natural nail than they have already had...as we all know MMA needs a roughed up surface to adhere so more than likely would have been e-filed to bits to start with.
Then as MMA clients are used to "Rock hard nails r us" they have nothing but problems with the instant difference in our products....instead i keep re balancing and they gradually get used to the difference and it only takes a few visits before the MMA has safely grown off and they are left with your products on their nails.
You would be doing your own prep on the new nail growth and the initial visit would have included looking for any tell tale signs of bacteria infections or nail separation.
Then as MMA clients are used to "Rock hard nails r us" they have nothing but problems with the instant difference in our products....instead i keep re balancing and they gradually get used to the difference and it only takes a few visits before the MMA has safely grown off and they are left with your products on their nails.
You would be doing your own prep on the new nail growth and the initial visit would have included looking for any tell tale signs of bacteria infections or nail separation.