I'm on my 13th (out of 36!) aligner and I'm noticing this gap between my canine and the bottom of the aligner. The rest of the aligner fits over my teeth perfectly it's just this one that has that gap. Shall I call my dentist and have it looked at? I haven't kept the aligner before it as I didn't think I needed it so I don't know what we would do. Any advice is appreciated. I'm a bit worried I'll have to pay for more aligners. I've attached a picture so you can see. Thank you