Can I Get 0.7 or 0.8ml of Restylane??

Since you didn't post a photo I have no idea about your facial aesthetics.  However, you may want to consider using a full cc of Restylane and using what isn't need for your upper lip in your lower.  I have noticed that the lower lip is often ignored but is a very important part of the facial aesthetic.

If the doctor thinks that you might need 0.7ccs of Restylane then using a 1cc. syringe is the most prudent course to follow as it would be cheaper than using two 0.4 cc syringes of Restylane. If there is excess that is not used elsewhere on your face, then the balance should be discarded and not saved for safety.

The amount of Restylane has to be tailored to each patient depending on what they need. Even though it’s sold by the syringe, you just put in what each individual needs to reach their desired correction.