I don't know your age, sex or how regularly you are getting your checkups, but if you are beginning to get cavities at a young age, I would consider getting molars extracted and start saving money for getting dentures ($1,000 to $1,500 for either the top or bottom plates), or implants ($3,000 per tooth). Please note that when teeth are extracted the other teeth can shift and the teeth adjacent to those extracted are more susceptible for cavities.
Other factors that you may want to consider are whether your enamel is thin, vitamin D deficiencies, and whether you think that you might get osteoporosis or diabetes. All of these factors weigh into your dental health. If your bone structures are weak and you are thinking about implants then be aware that they will use bones from cadavers to build up the jaw bones (which might be a concern based on your religious beliefs).
I'm 46 now and I'm speaking from experience in this area since I had composites and crowns in my twenties/thirties and they normally last about 15 years or so. I've lost a great deal of dental work within the past 2-3 years (I'm a diabetic). In 2011, I had an upper partial denture made for about $1,100 and a crown also which was nearly $2,000. All of that work is useless and I'm going to the oral surgeon today because the remaining five teeth up top will need to be pulled and I'll be getting a full upper denture. On the lower side, one the crowns on the molars came out and my two front teeth have broken off near the gum line so I expect that incisions will be necessary to remove all that work.
Good luck with your dental issues and I hope that the advice I offered is of help. I've probably paid out nearly $40,000 or so since I've been adult and I know that it can be extremely expensive. The positive things were that most of my dentists were pretty good and the dental clinic that I used while living in Austin continuously won awards for having the best looking hygienists.
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