21 NON-MEDICAL, MANUALLY-OPERATED ORAL HYGIENE APPLIANCES, NAMELY, TOOTHBRUSHES, DENTAL WATER JETS, INTERDENTAL CLEANING APPLIANCES AND COMBINATIONS OF THESE APPLIANCES IN AN ORAL CARE CENTER; NON-MEDICAL, ELECTRICALLY-OPERATED ORAL HYGIENE APPLIANCES, NAMELY, TOOTHBRUSHES, DENTAL WATER JETS, INTERDENTAL CLEANING APPLIANCES AND COMBINATIONS OF THESE APPLIANCES IN AN ORAL CARE CENTER