We have 2 Wagner Supersonic rechargeable toothbrushes that are still going strong in year 2.However, the model is discontinued and with it apparently the appropriate replacement brushes......These brush heads are the only ones you can order for Wagner brand toothbrushes but they do not fit older models well.So, does this mean we have to throw 2 perfectly good sonic toothbrushes away to buy updated models with fancier names?Will those then also be discontinued so replacement head won't be available again? Do I buy enough replacement heads to last 3 years?Sadly, I cannot recommend the Wagner brand is that is the case.....Wrong ones. Wish they had a better description.They are expensive however quite the buy considering they come prepackaged and with there own respective covers. Cant be any better than if they would add a travel brush with them.good