After a tooth extraction, a blood clot forms in the jaw where the tooth used to be. This blood clot is the first phase of healing after the extraction. Sucking on a straw can lead to loosing the blood clot in the wound. Any kind of suction in the mouth can dislodge that blood clot and cause the healing to be late, or even create a painful condition known as a dry socket. If the blood clot is dislodged it leaves the bone and nerve exposed to air, food, fluid, and anything else that enters the mouth. This can lead to infection and severe pain that can last for 5 or 6 days. Your local Castro Valley Dentist should be able to give your more information.
DO NOT USE A STRAW OR RINSE YOUR MOUTH FOR AT LEAST 48 HOURS. You can use a spoon for the shake or drink normally. Also, ice in a zip-loc bag wrapped in a thin towel applied to the face is soothing and helps with swelling. Do intervals of 10 minutes on and 10 minutes off as much as possible for first day. Take meds as directed. If problems persist, contact your local dentist and consider a whole new smile!