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dental cavity

Can a dental xray tell how deep the cavity is, or just that there is a cavity.  If it can only show that there is a cavity, is there any other tests a dentist can do to determine how deep the cavity is?
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I have a broken tooth and my dentist said he would not know whether I needed a root canal until he put a temporary crown on. I really think it depends on what he sees when he starts shaving away at tooth.
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X Ray can generally provide a dentist preliminary evaluation of a cavity how deep it is.
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Should I get a 2nd opinion, dentist says he cannot tell how deep it is until he gets in the tooth, and that I may need a crown.  I feel like this is what he really wants to do.  
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