I have been wearing 29 for about a month now since those side teeth do not want to come down. I visited the orthodontist 2 weeks ago, and he told me to keep wearing these trays for 2 more weeks and "keep chewing those chewies." (I have chewed two sets of chewies in half and have had to order more from Amazon frequently. These two teeth are a pain!) My next appointment is Thursday. If all goes well, then I will possibly have some teeth "polishing" (filing) done, and I will get many sets of trays.
Here are the pictures. My #29 pictures are coming from today, which is roughly 6 weeks since I took my #28 pictures. You can see a little improvement with those two side teeth.
#27
#28
#29