A tooth whitening system comprising: a reservoir device configured to hold an amount of a tooth whitening composition; and a mouth tray, the mouth tray comprising: a channel configured to receive tooth whitening composition dispensed from the reservoir device; an actuator configured to activate an electromagnetic radiation source prior to placing the mouth tray into an oral cavity of a user, wherein the electromagnetic radiation source is configured to emit electromagnetic radiation onto the tooth whitening composition in the channel of the mouth tray for a non-contact treatment time to pretreat the tooth whitening composition before placing a user's teeth into contact with the tooth whitening composition, and wherein the channel is configured to receive the tooth whitening composition at a location that ensures that the electromagnetic radiation emitted by the electromagnetic radiation source is emitted onto the tooth whitening composition; a processor operably coupled to the actuator and being configured to: start a timer device upon activation of the electromagnetic radiation source; activate a first indicator upon expiration of the non-contact treatment time to instruct the user to insert the mouth tray into the oral cavity so as to place the user's teeth in contact with the tooth whitening composition in the channel for a contact treatment time to whiten the teeth; and activate a second indicator upon expiration of the contact treatment time to instruct the user to remove the mouth tray from the oral cavity. a reservoir device configured to hold an amount of a tooth whitening composition; and a mouth tray, the mouth tray comprising: a channel configured to receive tooth whitening composition dispensed from the reservoir device; an actuator configured to activate an electromagnetic radiation source prior to placing the mouth tray into an oral cavity of a user, wherein the electromagnetic radiation source is configured to emit electromagnetic radiation onto the tooth whitening composition in the channel of the mouth tray for a non-contact treatment time to pretreat the tooth whitening composition before placing a user's teeth into contact with the tooth whitening composition, and wherein the channel is configured to receive the tooth whitening composition at a location that ensures that the electromagnetic radiation emitted by the electromagnetic radiation source is emitted onto the tooth whitening composition; a processor operably coupled to the actuator and being configured to: start a timer device upon activation of the electromagnetic radiation source; activate a first indicator upon expiration of the non-contact treatment time to instruct the user to insert the mouth tray into the oral cavity so as to place the user's teeth in contact with the tooth whitening composition in the channel for a contact treatment time to whiten the teeth; and activate a second indicator upon expiration of the contact treatment time to instruct the user to remove the mouth tray from the oral cavity. a channel configured to receive tooth whitening composition dispensed from the reservoir device; an actuator configured to activate an electromagnetic radiation source prior to placing the mouth tray into an oral cavity of a user, wherein the electromagnetic radiation source is configured to emit electromagnetic radiation onto the tooth whitening composition in the channel of the mouth tray for a non-contact treatment time to pretreat the tooth whitening composition before placing a user's teeth into contact with the tooth whitening composition, and wherein the channel is configured to receive the tooth whitening composition at a location that ensures that the electromagnetic radiation emitted by the electromagnetic radiation source is emitted onto the tooth whitening composition; a processor operably coupled to the actuator and being configured to: start a timer device upon activation of the electromagnetic radiation source; activate a first indicator upon expiration of the non-contact treatment time to instruct the user to insert the mouth tray into the oral cavity so as to place the user's teeth in contact with the tooth whitening composition in the channel for a contact treatment time to whiten the teeth; and activate a second indicator upon expiration of the contact treatment time to instruct the user to remove the mouth tray from the oral cavity. start a timer device upon activation of the electromagnetic radiation source; activate a first indicator upon expiration of the non-contact treatment time to instruct the user to insert the mouth tray into the oral cavity so as to place the user's teeth in contact with the tooth whitening composition in the channel for a contact treatment time to whiten the teeth; and activate a second indicator upon expiration of the contact treatment time to instruct the user to remove the mouth tray from the oral cavity.