Can the top of my bottom teeth be bonded, and how much wound it cost? There are a total of 6 on the bottom and 1-2 on the top.

I started having my upper teeth fixed prior to a fatal car wreck my daughter was involved in, & acquired a severe diffuse, axonal TBI. I care for her at home, and money is very tight. My lower teeth were in perfect condition at this time. Now the top of the bottom teeth are separating and u can see the yellow. Can this be bonded until I can afford crowns or veneers? An enormous amount of money was spent on veneers, crowns, root canals, etc. on my upper teeth, but the work wasn't finished. HELP!!