Oral care implement, handle thereof, and oral care refill head therefor

An oral care refill head for detachable coupling to a stem of a handle, the oral care refill head comprising:

• an oral care treatment portion;
• and
• a sleeve portion comprising:
• an inner surface that defines a sleeve cavity extending along a cavity axis;
• a first alignment groove formed into the inner surface on a first side of the cavity axis, the first alignment groove comprising a floor portion that extends along a first groove axis that is oriented at a first angle relative to the cavity axis;
• and
• a second alignment groove formed into the inner surface on a second side of the cavity axis that is opposite the first side of the cavity axis, the second alignment groove comprising a floor portion that extends along a second groove axis that is oriented at a second angle relative to the cavity axis, the second angle being less than the first angle, wherein the first groove axis intersects the cavity axis at a location within the sleeve cavity, and wherein the second groove axis does not intersect the sleeve cavity.

An oral care refill head for detachable coupling to a stem of a handle, the oral care refill head comprising:

• an oral care treatment portion comprising a plurality of tooth cleaning elements;
• and
• a sleeve portion comprising:
• an inner surface that defines a sleeve cavity extending along a cavity axis;
• a sleeve snap element positioned along the inner surface and configured to engage a stem snap element of the stem;
• and
• a single continuous alignment groove configured to receive a first alignment rib and a second alignment rib of the stem that are positioned 180° apart from one another, the single continuous alignment groove comprising a first portion located on a first side of the cavity axis for receiving the first alignment rib and a second portion located on a second side of the cavity axis for receiving the second alignment rib.