Ecrinal Serum Bitter Polish Enhanced Formula is a potent anti-nail biting serum designed to discourage the habit of nail biting. This enhanced formula contains a bitter agent that creates a discouraging taste when nails are brought near the mouth, helping to break the nail-biting cycle. The 10ml serum is easy to apply and dries quickly, leaving a bitter residue on the nails. The key active ingredients in this serum work to promote healthier nails and discourage the damaging habit of nail biting. The serum is suitable for both adults and teens struggling with nail-biting tendencies.