If a cavity stays untreated too long will the tooth just fall out?

It's best to catch cavities while they're small.  If cavities are untreated they'll continue getting bigger until they reach the nerve inside the tooth.  This will cause the tooth to start to hurt.  To resolve this pain the dentist can either do a root canal or extract the tooth.  If you have a cavity it's best to get a filling ASAP.  Good Luck!

It is unlikely that the tooth will just "fall out." What IS likely is that the tooth will continue to decay, increasing your chances for infection and other complications. 

If a cavity goes untreated for a long period of time you will most likely need to have a root canal. ($1,500) Then you will need a crown on top of that costing you ($1100+)

The tooth will NOT fall out.

If a cavity stays untreated it will likely start decaying the entire tooth and eventually lead to a gum infection and an abscess.  It's dangerous to walk around with pus in our gums.

Most every time a cavity goes untreated it ends up needing a root canal before it just falls out.  The only way it will fall out first is if you have a pretty severe case of periodontal disease.  If by chance if does fall out, most every time it will close up on its own with out the need for stiches.

The tooth usually doesn't fall out - it tends to BREAK off in PEICES and will often leave some tooth in the gums  (the root often stays behind)

If a tooth does fall completely out - the gum does re-seal on its own and does not need stitches.  

Most of the time, a cavity causes all kinds of pain and infections BEFORE it reaches the point of being bad enough to actually fall out.

It is much less trouble to have the tooth pulled by the dentist before it reaches the level of decay that would cause it to just fall out.  

Can cause an abscess which can affect your overall health, lead to infections elsewhere - damage hearing or even brain.  And rot can spread to jawbone - life without a jaw is not pleasant.

Just parts of it will while the root will still be inside the gums and may even protrude a little bit.

no on all of them