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Tylenol, or acetaminophen, is an anti pyretic primarily in additional to being an analgesic. Ibuprofen and most other nsaids are non steroidal anti-inflammatory and while also have analgesic properties, its primary function is to inhibit the inflammatory response aka swelling. Ibuprofen and nsaids work in the blood stream and prevent a certain stage of inflammation which prevents the process. This results in reduction in swelling which results in pain relief because the pain is from the increased pressure in the area from excess swelling. Acetaminophen or Tylenol doesnt do any of this; it works in the brain, the hypothalamus i believe, off the top of my head, and in the brain, it binds to receptors that cause the pain response and essentially tells the hypothalamus that everything is okay and they dont need to activate the cascade response like fever. Its analgesic properties occur secondary because the pain receptors are not being activated like they would normally. So with this understanding, Ibuprofen and Tylenol affect the process differently. Generally acetaminophen wont interfere with local inflammation like on a wound because the inflammation process is still occuring at that level. Ibuprofen however would potentially interfere with healing because the lack of inflammation prevents blood from transporting nutrients as quickly. However these are all considerations for treatment with a balance in mind. While we want a quick healing process of an injury, if the swelling is so extensive it cuts off circulation to the rest of the limb or prevents the injured area from being mobile then its warranted. If the swelling causes too much pain then the physiological response too the pain can divert energy and resources away from the injury. We have to remember that the body is not smart, just a machine and it will do something regardless of the affect on the larger system because it just reacts. As for your mouth question, different tissue has different needs for repair and saliva has alot of enzymes and nutrients that promotes healing in the mouth because it kills most forgein bodies and the protein amalyse can provide new protein structures for cell repair faster than other areas. In general to promote healing in most places, keep the area moist, protected from outside infections, and provide the body with rest of nutritional food. This will provide optimal chance for cell regeneration. I worked a pediatric clinic and many of my young patients had quick healing injuries because we cleaned them, covered them, and gave them rest and a chance to heal...and kids are good at following doctors instructions whereas adults often have differing opinions based on life experiences and anecdotal knowledge like the "let a wound breathe" concept. This can be good for a wound that has alot of discharge but most wounds are just being exposed to more bacteria and healing is delayed. The body is good at getting back to homeostasis, we just need to help it out.