Quick answer

Choose the Nova Sonic if you want a straightforward sonic toothbrush with an easy-to-swap replacement head and a lower-cost path to keeping the brush going. Choose the Curve Toothbrush if its handle shape and brushing feel match how you already brush. Both are BURST sonic brushes, and both use BURST replacement heads, so the real decision is handle preference, not cleaning technology.

What actually differs between the Curve and Nova Sonic

Both are sonic toothbrushes from BURST Oral Care, a brand backed by dental professionals. The supplied catalog facts do not list separate motor speeds, timer settings, or pressure sensors for either model, so you should not assume one is stronger or smarter than the other. What the catalog does confirm is that the Nova Sonic uses the Nova Sonic Replacement Head, which is standard size, fits most users, and attaches and removes simply for quick swaps.

That means the meaningful difference for most shoppers is the handle and how it feels in your hand during a two-minute brushing session, plus which replacement head you will be buying every few months. If you already know you prefer a particular handle shape, that preference matters more than a spec sheet that is not published.

Replacement heads: the cost you keep paying

A toothbrush is a subscription to brush heads, not a one-time purchase. The Nova Sonic Replacement Head is listed at USD 7.50 with a comparison price of USD 10.00, and the Original Brush Replacement Head is listed at USD 5.68 with a comparison price of USD 8.00. The Original head uses super-soft, tapered bristles that clean under gums and polish teeth, and it fits any Original Sonic Toothbrush.

If you brush firmly or have gum sensitivity, the super-soft tapered bristles on the Original head are the more relevant detail than the handle model. If you want the simplest swap and a standard fit, the Nova Sonic head is designed to keep your BURST sonic toothbrush performing at its best with a fresh, effective clean.

Kids in the house change the math

If you are buying for a family, the Kids Sonic Toothbrush is the model built for children, and it uses the Kids Replacement Head, listed at USD 5.12 with a comparison price of USD 8.00. The kids' head is designed for a comfortable, effective clean and is easy to swap out for regular brushing routines.

Neither the Curve Toothbrush nor the Nova Sonic is described in the supplied facts as a kids' model, so do not buy an adult brush and assume a child can use it comfortably. Keep the kids' brush and kids' heads as a separate purchase, and keep adult heads separate so the sizes do not get mixed up in the bathroom cup.

How to decide in the store

Pick the handle you would still be happy holding on a rushed morning. Then check that the replacement head you will reorder is the one that matches that handle, because a head that does not fit is the most common reason a good brush ends up in a drawer. If you are switching from a manual brush, either model is a reasonable step up; if you already own a BURST Original Sonic Toothbrush, the Original Brush Replacement Head keeps that brush running without buying a new handle.

Trade-offs to weigh before you buy

  • Nova Sonic: simple, standard fit: The Nova Sonic Replacement Head is standard size, fits most users, and is easy to attach and remove, which keeps the swap quick. Best if you want a no-fuss head change and a standard fit.
  • Original head: gentler bristles: The Original Brush Replacement Head uses super-soft, tapered bristles that clean under gums and polish teeth, and it is listed at a lower price than the Nova Sonic head. If sensitive gums are your main concern, start with the super-soft tapered bristles.
  • Kids: separate brush, separate head: The Kids Sonic Toothbrush and Kids Replacement Head are their own system, and the kids' head is designed for comfortable, effective cleaning with easy swaps. Do not substitute an adult brush for a child's brush.
  • Unpublished specs: The supplied catalog facts do not list motor speed, timer, or pressure sensor differences between the Curve and Nova Sonic. Decide on handle feel and head cost, not on specs that are not published.

Product facts

  • Nova Sonic Replacement Head: The Nova Sonic Replacement Head is designed to keep your BURST sonic toothbrush performing at its best, is compatible with BURST Sonic toothbrushes, is standard size to fit most users, and attaches and removes simply for quick swaps. If you choose the Nova Sonic, this is the head you will reorder, and the standard fit plus simple swap keeps the routine low-effort.
  • Original Brush Replacement Head: The Original Brush Replacement Head has super-soft, tapered bristles that clean under gums and polish teeth, and it fits any Original Sonic Toothbrush. If your priority is gentle bristles along the gumline, this head is the relevant pick, and it is the lower-priced head in the supplied catalog.
  • Kids Sonic Toothbrush: The Kids Sonic Toothbrush was developed with input from dental professionals, many of whom are parents, and is clinically proven to be more effective at removing dental plaque than a manual toothbrush. For a child, this is the model to buy instead of handing down an adult Curve or Nova Sonic.
  • Kids Replacement Head: The Kids Replacement Head is designed for a comfortable and effective clean, is easy to swap out for regular brushing routines, and is made for BURST kids' toothbrush models. Buying the kids' head alongside the kids' brush avoids the fit problem of mixing adult and child heads.

Which one fits you

Best for

  • Shoppers who want a standard-size replacement head that fits most users and swaps quickly
  • Anyone who prefers super-soft, tapered bristles for cleaning under the gums
  • Families buying a separate Kids Sonic Toothbrush and Kids Replacement Head for a child

Not for

  • Buyers who need published motor speed, timer, or pressure-sensor specs to decide, since those are not in the supplied catalog facts
  • Parents looking to hand an adult Curve or Nova Sonic down to a young child instead of using the kids' model