You can schedule with your dentist and have him/her do a full mouth examination with X-ray. You have no obligation whets so ever to start treatment with the dentist. You have the right to get a treatment plan with overall cost estimate, yet elect not to start any treatment. exam cost varies between dentists, new dentists trying to establish their practice charge very little money, as they need to build their patient pool, so they offer a comprehensive examination with x-ray sometimes for almost no money, to be realistic around $30-40, however, established dentists with an older office, they charge much more for en exam, and it could be as much as $500. a good avg. for a first exam would be around $150.
It's really hard to give an estimate regarding a bonding for your front teeth, as I can't see the extent of the damage, plus I don't know your expectations of the treatment. But if they are typical erosion lesions, they can be 3 surface composites for around $180-200 each, and could be much more depending on the dentist. If you have very high expectation of the treatment outcome, you're better off doing porcelain veneers on front teeth, avg. is $1000 each.
Honestly, your best bet would be to find a good dentist in your area, pay his fees for his exam, and have a detailed sheet of your treatment with the cost. Explain to him/her your situation, and you are a cash patient with no insurance, and would like to know if you can afford this treatment or not, most dentists will understand this situation, and help you out. we face these situations almost on a daily basis, so there is nothing to be worried about.
It's important to get your exam done, just to make sure you don't have major dental problems that pass unnoticed, like periodontal disease, big cavities that might turn into a root canal, or soft tissue lesions that are asymptomatic and require treatment. You need to know that pain is usually the last indication of a problem in dentistry. a pain free patient can have tons of problems, and not even aware of it, that's why a regular check up with your dentist is very important.
I hope you schedule your appointment very soon, Good luck.