Since wearing Invisalign, front top composite fillings have broke several times in same place. Dentist says aligner pressure causing them to break. Ortho says it should not. Very frustrating, got same fillings re-done (1-3x) front broke after 2 days. So walk around w-broke teeth til aligners are done? Is this normal? I finished set of 24 & set 19. Now need yet another set. Getting crowns on top & bottom front 4 But told I had to fix overbite & grinding damage b4 getting. Plz help!