Dr Atkins says: “Although it may seem like a kind gesture to share your toothbrush, it really is not a very good idea. Sharing a toothbrush leaves you susceptible to all sorts of oral and general health problems.

Is it bad to share toothbrushes?

Alone, it's harmless, but as it digests the sugars in your mouth, it creates acid strong enough to erode enamel. If someone has more of these bacteria in their mouth because of poor oral hygiene, you may get more too by sharing their toothbrush, increasing your risk of decay.

Is it weird for couples to share a toothbrush?

Dr Frick says "it's probably a good point" that toothbrush sharing isn't much different to kissing, but says "if your partner catches a viral infection, the shared toothbrush may be responsible for the transmission of the virus to you". "It's a better idea to have your own toothbrush. It's low risk."