Don’t brush your teeth right after a bout of morning sickness. This removes the natural alkaline, potentially increasing damage to the enamel. Use a fluoride mouth rinse instead to neutralise the acid. If morning sickness makes it difficult to clean your teeth, use a child-sized toothbrush and avoid frothy toothpastes. Tender gums are more likely to harbour bacteria, causing plaque to form. This damages the gums and brings on gingivitis, which can lead to periodontitis, an infection of the structures around teeth. If left untreated, it can damage the bone that supports teeth. Studies suggest periodontal infection increases the likelihood of premature births or infants with low birth weights, upping the risk of health problems later on.