Dental cavities: Root canal and dental filling questions...

One dentist told me the following:

- 4 of my teeth have cavities
- out of these 1 requires root canal


I am taking second opinion and then would move ahead with the appropriate treatment. Would prefer a biological dentist.

My questions:
- Is filling these cavities by composite filing the best way, or should some other process be done?

Any other suggestion I must consider while going for the treatment would be helpful.

I am not covered by any dental insurance plan, so would need to bear the entire cost. I am going through treatment for parasites for the last 2 years.

Not much aware about the dental treatment, therefore some questions might have been too basic, thanks for the patience and help.
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