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3 doctors weighed in: When during pregnancy should you stop laying on your back? 3 doctors weighed in Want a second opinion? At approximately 24 weeks you should avoid laying on your back for prolonged periods of time in order to avoid compression of veins (vena cava). In brief: 6 months.
Dental work such as cavity fillings and crowns should be treated to reduce the chance of infection. If dental work is done during pregnancy, the second trimester is ideal. Once you reach the third trimester, it may be very difficult to lie on your back for an extended period of time. The safest course of action is to postpone all unnecessary dental work until after the birth.