Systems and methods for measuring an oral arch geometry and selecting a mouthpiece based on oral arch measurements

1. A method for selecting a design for a mouthpiece for a user, comprising:

receiving a signal with a personal care system to initiate oral arch measurements using a personal care device,

collecting data from a position sensor related to a location of a probe of the personal care device as the probe is moved about an oral arch of the user;

determining, by a controller of the personal care system, a dimension (W 1 , W 2 , L 1 , L 2 ) of the oral arch from the data;

selecting, by the controller, a design for a mouthpiece for the user based on the dimension of the oral arch; and

transmitting information identifying the mouthpiece design to an intended recipient.

2. The method of claim 1 , further comprising transmitting a sequence of a plurality of oral arch positions at which the user is instructed to touch the probe of the personal care device.

3. The method of claim 2 , wherein the positions in the sequence include at rear molars, at front teeth, at canines, or a combination including at least one of the foregoing.

4. The method of claim 2 , wherein at least a portion of the sequence is repeated or reversed in order and then repeated.

5. The method of claim 2 , wherein the determining includes:

obtaining a velocity of the probe from the data;

generating a velocity curve as the velocity over time;

identifying a plurality of local minimums in the velocity curve;

integrating an area under the velocity curve and between an adjacent pair of local minimums; and determining the dimension of the oral arch as a result of the integrating.

6. The method of claim 5 , further comprising correlating each of the positons to one of the local minimums using a known order of the sequence.

7. The method of claim 5 , further comprising connecting a line between the adjacent pair of local minimums, and bounding the area with the line to eliminate drift or sensor error during the integrating.

8. The method of claim 5 , wherein the data includes acceleration data and the obtaining includes integrating the acceleration data.

9. The method of claim 1 , wherein the position sensor includes a plurality of position sensors and the collecting includes collecting data with each of the positions sensors.

10. The method of claim 9 , wherein the plurality of position sensors includes a camera or proximity sensor and an inertial measurement unit.

11. The method of claim 1 , wherein the controller is included by the personal care device, a remote device separate from the personal care device, or a combination including at least one of the foregoing.

12. The method of claim 11 , wherein the remote device is a charging station, smartphone, or other computing device in communication with the position sensor.

13. A personal care system comprising:

a personal care device having a probe;

a position sensor configured to collect data related a position of the probe; and

a controller configured to:

determine a dimension (W 1 , W 2 , L 1 , L 2 ) of an oral arch of a user from the data;

select a design for a mouthpiece for the user based on the dimension of the oral arch;

and transmit information identifying the mouthpiece design to an intended recipient.

14. The personal care system of claim 13 , wherein the personal care device is an electric toothbrush, an interdental cleaning device, a flossing device, or an oral irrigator.

15. The personal care system of claim 13 , further comprising a remote device in communication with the position sensor, the remote device comprising the controller.