A chipped tooth which is very mild at the level of enamel is of cosmetic concern and a small composite restoration (dental filling) will suffice.
A chip extending into the dentine is considered like the skin peeled off during a scratchy fall. It should ideal be bandaged immediately to provide good healing. The same applies to the tooth. It should be closed with a dental filling like composite and if it is close to the pulp it should be protected with calcium hydroxide.