If one of your Invisalgn attachments fall off you should not be alarmed. It should not be considered an immediate dental emergency. I recommend you contact your treating dental office so that it can be arranged to have a new attachment bonded in place. You can con continue to wear your current aligner over the missed attachment.
The Cost of Dental Porcelain Veneers can range from $900-$2000. This depending on the location you are being treated and the type of dental practice and experience of the Dentist who is treating you. A veneer in NYC will generally cost more than a veneer in Topeka, Kansas. A dental Clinic type practice is generally less expensive than a boutique, high-end cosmetic and restorative dental practice where the dentist is very experienced in doing Veneers and other cosmetic dental procedures. The higher fee may also be the result of the Dental Lab the dentist is using to fabricate the Veneer (the better quality labs charge the dentist more for the veneer fabrication which in turn the dentist passes the cost on to the patient).