On 31 Jan 2013, went to have my 2nd visit for my invisalign. 17 attachments placed on my front teeths, done by a oral hygienist.
The hygienist mentioned that my front set of teeths will not be align until tray no 11. For the first 10 trays, it will help to expand my upper and lower jaw, increase the gaps between the teeth and tilting my 2nd and 1st lower molar upright.