Bioamer ia a nail varnish that contains an agent that will give bittery taste to the nails and by that sucking the thumb and biting the nails would not be an option anymore (starting 3 years old)
Apply every day until the habit of biting your nails or sucking your thumb stops.
Treatment of naked nails: 1 or 2 layers
Daily Top Coat Care: 1 layer on color varnish

For Onychophagia (Nail biting and thumb sucking)

Ingredients

Denatonium Benzoate: bitter active ingredient
Vitamins E, B5 and calcium: moisturizing and antioxidant properties
Extracts of algae and nettles: bring the nutrients and minerals necessary for the growth of the nail

ETHYL ACETATE, BUTYL ESTER OF PVM/MA COPOLYMER, ALCOHOL DENAT., ADIPIC ACID/NEOPENTYL GLYCOL/TRIMELLITIC ANHYDRIDE
COPOLYMER, ISOPROPYL ALCOHOL, BUTYL ACETATE, N-BUTYL ALCOHOL, DENATONIUM BENZOATE, ACETYL TRIBUTYL CITRATE, ETOCRYLENE, AQUA, PROPYLENE GLYCOL, GLYCERIN, MEK, TOCOPHERYL ACETATE, ASCOPHYLLUM NODOSUM EXTRACT, CALCIUM PANTOTHENATE, ALLIUM SATIVUM BULB EXTRACT, PHENOXYETHANOL, URTICA DIOICA EXTRACT, CI 60725