A chipped tooth can occur due to various reasons, including biting down on hard foods or objects, such as ice or candy. Accidents or trauma, like a fall or sports injury, can also cause chipping. Teeth weakened by decay or large fillings are more susceptible to damage. Grinding or clenching teeth, especially during sleep, can lead to fractures over time. Lastly, sudden temperature changes, like eating something cold after hot food, may weaken tooth enamel and cause chipping.