Q. I have paid for a treatment for Invisalign. My first impressions were taken on 18th Dec when i paid about 80% of the payment of the treatment. On 8th Jan i was called in again for a second impression as there were some air bubbles. Since then the doc is unable to give me a date when the treatment will be available. I am getting a bit anxious about the whole thing . Could you please advise on how long it could take for the treatment to begin after the moulds have been sent . Many thanks for your reply.