The simple answer to your question is : Yes.
Q switch nd-yag laser rejuvenation helps rejuvenate your skin from the inside by stimulating collagen production and controlling pigmentation. It has very minimal impact on the surface of the skin, unless you are using the laser to specifically remove light freckles.
Your skin is still going to be prone to dirt, dust, oil and foreign substances that will clog up your pores and lead to acne and skin deterioration. A proper facial would still be very useful if you wish to maintain your skin health and radiance in a holistic way.
Skin will require a combination of treatment to stay healthy. Laser alone is not going to do magic.
I hope this helps.
Sincerely,
Dr Sii Sik Liong