Invisalign retainers are of good quality and delivered all at once (4 pairs) after you purchase them. If you do not plan to have any new restorations (crowns, veneers, bridges, implants or fillings) in the next few years, an Invisalign retainer is an excellent option. If you want a retainer that is flexible enough to accommodate your future needs, you should consider our in-house retainers to be. For young kids with baby teeth not replaced yet, we do not recommend Invisalign retainers, as their teeth will transition into full permanent dentition in the following years.