A mouthpiece includes an outer portion comprising a first side, a second side, a first pillar coupled to the first side and configured to rotate about a first axis, a second pillar coupled to the second side and configured to rotate about a second axis, a first upper gum support coupled to the first pillar and configured to rotate about a third axis that is perpendicular to the first axis, a first lower gum support coupled to the first pillar and configured to rotate about a fourth axis that is perpendicular to the first axis, a second upper gum support coupled to the second pillar and configured to rotate about a fifth axis that is perpendicular to the second axis, and a second lower gum support coupled to the second pillar and configured to rotate about a sixth axis that is perpendicular to the second axis.