This is also called malocclusion and leads to several problems like difficulty in chewing, speech, wearing of teeth, and can also increase the chances of injury to the teeth and joints in the jaw.
Perfectly aligned teeth form a U-shaped arch. In cases of crowded teeth, teeth do not follow this pattern. This causes difficulty in cleaning them, and allows plaque and tartar to build up.
Gaps between your teeth can alter your teeth alignment and bite. These spaces can be corrected using orthodontic appliances.