hello and welcome to HCM forum,
i would like to inform you that when veneers are placed,oral hygiene
maintenance is very important,
in your case it seems, gums are inflamed and are receding.
i recommend use of antibacterial mouth wash(2 times/day),
kindly see your dentist
soon to avoid infection from spreading to the adjacent tissues,
avoid applying garlic or any other topical agent until prescribed by a doctor.
i hope i answered your query.
i wish you good health.