The salivary oestrogen levels are higher in the women who are destined to have preterm babies than in women who have normal term deliveries. The salivary oestrogen increases the proliferation and desquamation of the oral mucosa and also an increase in the subgingival crevicular fluid levels. The desquamating cells provide a suitable environment for bacterial growth by providing nutrition, thus predisposing the pregnant women to dental caries [16].