Thanks to all. Adding to question. 6 new front crowns permanently cemented in 4 wks ago. 1st week, feel loose, all moving to left and dropping, new fillings fell out, 2 front crowns fell out sipping water in middle of doc presentation. Dentist said, crowns not loose, just feels like it, however crowns fell out cause loose, color not white as temps cause temps are acrylic. Is this true? Went to cosmetic d- got resident d. Invisalign suggested while waiting on crowns that fell out.. Is that normal?