Grills and retainers serve completely different purposes and are not interchangeable. A grill is a decorative piece of jewelry, typically made of gold, silver, or other metals, that snaps over your teeth for cosmetic effect. You can remove it whenever you want. A retainer is a medical device custom-fitted by an orthodontist to prevent your teeth from shifting back after braces or Invisalign treatment. It applies specific pressure to keep teeth aligned. The structural differences matter. Retainers are made from medical-grade plastic or wire, molded precisely to your bite pattern and tooth positions. They're designed to apply gentle, consistent pressure over months or years. Grills are mass-produced or custom-shaped for appearance only—they don't apply corrective pressure and won't prevent tooth movement. Wearing a grill long-term can actually cause problems: trapped bacteria, gum irritation, and enamel damage from poor fit or material reactions. If you're thinking about this because retainers are expensive, understand that skipping them after orthodontic work means your teeth will shift back, often within months. A replacement retainer in Canada runs $150–$400 depending on type and location. Grills cost anywhere from $20 for cheap online versions to several thousand for custom gold pieces, but they provide zero orthodontic value. One clarification: some people confuse permanent grills (dental veneers or crowns) with removable grills. Veneers are a cosmetic dental procedure, but they still don't function as retainers. Only an orthodontic retainer prescribed by a dentist or orthodontist will maintain your alignment. If cost is the issue, ask your orthodontist about payment plans or look for dental schools in Ottawa, Toronto, or Montreal that offer reduced-rate retainer services through supervised students. Trying to substitute a grill for a retainer will cost you far more when you need braces again.