Dual Oral B toothbrush chargers...

The toothbrushes don't need charging every time so 1 charger would be enough for 2 toothbrushes. Just charge when needed. We have 4 of these toothbrushes in our house 2 up stairs and 2 down and just one charger in each. 5 of us share the 4 toothbrushes and have a head each up stairs and one each down stairs.

I'd say go for the best one and just change heads. You can put it on charge in the morning and it will be fully charged by lunchtime. These can cost up to £200, ours did though luckily we got them half price. We do have two but an afterthought was one would do unless one of you travels without the other, believe me you will never go back to a manual.

each toothbrush comes with a charger. A charge lasts a week and takes 12 hours to recharge. Just start using yours 3 days after your wife and you should rarely clash using just the one charger