Bmohan ji,

I think NYU has dental but they dont give you urgent appointment. Here you go:

212-206-5200  this is the number for  free clinic of NYU. I strongly suggest you to call them and ask for urgent appoinment. If not you can always go to emergency and for emergency , you dont have to pay. I only know the elmhurst hospital. However, you have to wait at least 6 hours to get your trun. I also know one clinic which chare you $55 for check up.  Feel free to ask me if you need any further help.By the way "Lwan ko tel" works great for my husband. You can get it in indian store like butala.