First, to prevent pregnancy gingivitis it is especially important to practice good oral hygiene habits, which include brushing at least twice a day, flossing once a day, and using an antimicrobial mouth rinse. If you are due for a professional cleaning, don't skip it simply because you are pregnant. Now more than ever, professional dental cleanings are particularly important.
Gum disease that doesn't get better may need to treated by a dental professional. Treatments may include antibiotics and excision of affected tissue.