A 42-year-old patient

comes to his dentist for a regular check-up. The patient suffers from

periodontitis for a long time, which is an inflammatory disease of the

supporting apparatus of the teeth, which consists of the gums, periodontal

ligaments, cementum, and the alveolar process of the bone. The cause is the activity

of microorganisms, their multiplication promotes dental plaque and tartar.

Periodontal ligaments made of dense connective tissue fix the tooth to the gum

or alveolus. Their quality can be significantly impaired even by the lack of

one vitamin. Which one?