An oral device comprising: an insert configured for placement in an oral cavity in contact with teeth in the oral cavity, the insert comprising: a facial portion comprising a first surface configured for placement proximate a facial surface of the teeth; a lingual portion comprising a second surface spaced from the first surface and configured for placement proximate a lingual surface of the teeth; a base connecting the facial portion and the lingual portion , the base , the first surface, and the second surface forming a channel for receiving the teeth; a first electrode arranged proximate the first surface; a second electrode spaced from the first electrode ; and at least one first electrical connector electrically connected to the first electrode and the second electrode ; and an activating member configured for placement in the oral cavity, the activating member being configured for releasable attachment to the insert and comprising: a housing configured to be completely received in the oral cavity; a power source disposed in the housing; and at least one second electrical connector electrically connected to the power source , the at least one second electrical connector being releasable connectible to the at least one first electrical connector to supply power from the power source in the activating member to the first electrode and the second electrode in the insert , wherein the housing comprises a housing base , an arcuate housing facial wall extending from a top surface of the housing base , and an arcuate housing lingual wall extending from the top surface and spaced from the lingual wall. a facial portion comprising a first surface configured for placement proximate a facial surface of the teeth; a lingual portion comprising a second surface spaced from the first surface and configured for placement proximate a lingual surface of the teeth; a base connecting the facial portion and the lingual portion , the base , the first surface, and the second surface forming a channel for receiving the teeth; a first electrode arranged proximate the first surface; a second electrode spaced from the first electrode ; and at least one first electrical connector electrically connected to the first electrode and the second electrode ; and an activating member configured for placement in the oral cavity, the activating member being configured for releasable attachment to the insert and comprising: a housing configured to be completely received in the oral cavity; a power source disposed in the housing; and at least one second electrical connector electrically connected to the power source , the at least one second electrical connector being releasable connectible to the at least one first electrical connector to supply power from the power source in the activating member to the first electrode and the second electrode in the insert , wherein the housing comprises a housing base , an arcuate housing facial wall extending from a top surface of the housing base , and an arcuate housing lingual wall extending from the top surface and spaced from the lingual wall. a housing configured to be completely received in the oral cavity; a power source disposed in the housing; and at least one second electrical connector electrically connected to the power source , the at least one second electrical connector being releasable connectible to the at least one first electrical connector to supply power from the power source in the activating member to the first electrode and the second electrode in the insert , wherein the housing comprises a housing base , an arcuate housing facial wall extending from a top surface of the housing base , and an arcuate housing lingual wall extending from the top surface and spaced from the lingual wall. <EOS>