Traditional (Hawley) retainers have a piece of wire attached to plastic (or acrylic). Clear retainers (Essix) are also plastic but don't have any wires. Both are custom-made to fit your teeth.
Here's my advice: Pitch only to existing clients or clients you know well. Never pitch a retainer agreement to someone you've never worked with before. Present the retainer as a way to get “front of the line” status. Highlight the benefit of predictable budgeting. Include a small discount (maybe)
The best retainer agreement templates will include: Term of the agreement: What the effective date is and how long the agreement lasts. Scope of work: The work you've agreed to complete every month. Assigned work: How work will be assigned and what happens when not all the hours or deliverables are assigned by the ...