Does it matter whether you apply C02 vertically or horizontally?

Hello, i got the CO2 laser to improve my smiling lines. The doctor applied laser at deep level to my smiling lines vertically. My lines really got worse and deeper than before. This made me really frustrated and sad. I thought he must have applied the laser horizontally to better smooth lines. I would like to ask If it matters whether you apply laser vertically or horizontally. Thanks you so much