- The retainer should be stored in a dry and clean case to protect it. - You do not want to soak it in any solutions overnight because that can weaken the plastic. - You also want to keep it away from heat since heat will warp the material. -(Don't put it in your dishwasher or boiling water!). - Assorted. - 12 Pcs. - Size Medium. **For further product information, please contact Chat Support**