Crowding in urbanization refers to urban centers being overpopulated. People usually come to seek employment and do business in urbanized areas which results into crowding.

a compression wave is the crowding of molecules a rarefaction is spread apart molecules

This depends on the amount of dental crowding present. Slight crowding my be corrected with a series of retainers or with the "Invisalign" method. If your teeth are straight and you don't have an overbite, probably not. If crowding is your ONLY problem then they will just probably extract them either by pulling them or they will put you to sleep and cut them out.

Definition: finance governmental deficits' spur to investment: the theory that a country's budget deficit in periods of economic depression can lead to higher private investment because it brings higher government spending and monetary growth

crowding