A pregnant woman's breath may suffer as a result of morning sickness. Stomach acid erodes dental enamel. If morning sickness is producing vomiting, combining 1 cup of water with 1 teaspoon of baking soda is recommended. After vomiting, rinse your mouth with this combination. This will aid in the neutralization of the acid. It will aid in the protection of the tooth enamel. After washing your mouth with a mixture of baking soda and water, wait approximately an hour before brushing your teeth since brushing exposes the teeth to stomach acids. Acid reflux, which some pregnant women suffer later in their pregnancy, has a similar effect on the breath.