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Get enough cavities in your teeth and they fall out, making crowding a lesser problem than the lack of teeth. Perhaps tooth crowding is a problem now because people have better dental care?

No, because tooth crowding is a severe health-threatening problem long before one gets to the age when teeth are falling out, plus even people with lost teeth often get life-threatening complications from impacted wisdom teeth -- they quite simply emerge too far back in the jaw. Too far back for our *modern* jaws, anyway -- apes' wisdom teeth fit just *fine* in their long jaws. Hint, hint.

The most striking difference between human teeth and ape teeth is the absence in humans of huge canines. Human teeth are generally smaller and less specialized than those of apes. Since large canines are used in many primate species for social display and competition for dominance, the loss of distinctive canines in Hominid species is sometimes taken as a sign that less competitive and more cooperative forms of social behavior had emerged in very early times.

source:
http://www.wsu.edu:8001/vwsu/gened/learn-modules/top_longfor/phychar/culture-humans-14fourteen.html

A charming smile replaced the need for ferocious canines?

This is very interesting about the wisdom teeth...I had 2 wisdom teeth, and had to have them both pulled, because my mouth was too small to accomodate them...my girlfriend had 4 wisdom teeth, and had to have all 4 of them pulled for the same reason...

X-Rays show that my husband never had any wisdom teeth to begin with...neither one of our boys ever had any wisdom teeth either...thankfully, my boys genetics were such, that they never had any wisdom teeth, just like their dad...

So to me, that shows, that slowly, the incidence of wisdom teeth in humans is declining...some people have all four wisdom teeth, ,some have fewer than 4 wisdom teeth, and many have no wisdom teeth at all...

Some people have 4 wisdom teeth, some have less than 4, and some have none at all...is that evolution at work?...since wisdom teeth are not necessary for human beings, and more often than not, they are just a pain, become impacted and have to be removed by a dentist, doesnt understanding evolution explain the decline in people having wisdom teeth?...we dont need them, so eventually the human race will no longer have them...

Please remember, my understanding of evolution, is at best, minimal...

The evolutionist says humans have arms for tree climbing, but our skin is not furry and protected from rough surfaces, leaving us vulnerable to dangerous abrasions which can become infected and deadly -- a more common danger than dying from impacted wisdom teeth.
If some of our molars rotted and fell out, we would have room and need for wisdom teeth to grow in and replace them, regardless of the length and strength of our jawbones. Dentistry is the cause of tooth crowding trends moreso than you will admit.
The factors I bring up are valid, even if evolutionists prefer not to address them.