Teeth are inherited but the bad habits of previous generations do not have to be. A good oral hygiene regimen can prevent cavities and gum disease. Teeth alignment is what usually is inherited due to discrepancies in tooth shape, size and jaw size. For example, large teeth in a small jaw can lead to crowding of the teeth. Small teeth in a large jaw can lead to spacing. Spacing between the two front teeth is called a diastema which is an inherited trait. Eating Habits during development of the teeth can also affect the health of teeth. Not having enough calcium in the diet during teeth development may cause the teeth to be weaker and predispose it to cavities. Having fluoride in the diet during teeth development has also shown to strengthen teeth and resist cavity formation.