Cutouts on trays

So I've been wearing clear aligners for 4 months now and my last appointment I was given 7 trays with me(9th-15th)2 weeks for each tray. I just switched to the 11th of trays and it has 2 cut outs on the top and bottom trays two on the top teeth on the canines and 2 on the bottom teeth on the 2nd molars. The same for 12th,13th, 14th,15th but little bit different cut on buttom teeth. what are these I did a bit of googling and they seem to be used for elastics but I was given no elastics and no one in my last appointment mentioned elastics at all and I can't find any more information on uses besides elastics. Do they help in moving the teeth or something in another way or did they just forget to give me information because they never once mentioned the precision cuts when I was getting these trays. I have 1year and 6 months treatment. 1year for strightening teeth and 6months for bite correction. Deep bite.

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