So not only have I been waiting 5+ months for the replacement heads to be restocked in FIRM, I received these MEDIUM replacement heads with no plastic caps on them. I understand this is a minimal thing but I use my toothbrush when I’m traveling and now I have to go out and buy something to protect my brush head. I don’t know what’s happened lately with these Greater Goods products but I’m feeling like I’m going to need to look elsewhere for my dental needs. And that sucks because I love what the company stands for and I love my products when they’ve been up to par.I love my GreaterGoods electric toothbrush and these heads for it. Comes with three so you can use a new one every 3-4 months!This is my third purchase of the replacement heads and as previous review by Kenneth mentioned the most recent order was missing the plastic covers. Those are needed for sanitary purposes if you, like most people, keep your toothbrush in your bathroom. With the plastic covers missing you have to reuse the old one over and over again.Giving three stars because I understand people have business to run.Started using these to gain my sensation of smell back. Rose, lemon and eucalyptus are on point. But clove is very strong and gave me headaches initially but got used it now.The brush heads work on the electric toothbrushI've had soft and hard bristle and medium is just right, when I used hard, my gums would bleed, medium is the good threshold for me, but you should test it out and see for yourself.Low price, easy and decent quality. These are just like the original brushes and were 3 for 9$. Exactly what I neededGreat replacement, i needed and was looking for some replacements for my toothbrush. I'm glad i came across these.