Proper care can prolong the life of a finish, making the surface of furniture slippery so that objects slide along it without scratching. For new furniture, read manufacturers' tags and literature. Consider consulting a conservator for tips on caring for especially valuable antiques and heirlooms. Changes in humidity, not a lack of oil, cause wood to crack. If used properly, paste wax will provide a thick, hard, lasting finish.
Liquid wax is similar, but typically provides a thinner coating.
Waxes dry hard so they do not smear and attract dust and dirt. Paste wax typically lasts six months to a couple years, depending on how much the furniture is used and how many coats are applied. Paste wax will help delay the formation of water rings, giving you a little extra time to wipe up the moisture. Some people, especially antique lovers, prefer the soft sheen provided by waxes. Wax will not interfere with future refinishing.