What makes your bristle?

Advert

What makes your bristle?

Home Forums General Questions What makes your bristle?

Viewing 25 posts - 1 through 25 (of 37 total)
  • Author
    Posts
  • #403826
    Sam Stones
    Participant
      @samstones42903

      The stiffness of a toothbrush bristle is proportional to …

      1. The modulus of the material,
      2. The cube of its length,
      3. The 4th power of its diameter.

      Given that we would choose a soft material to use as a lap, why is dental advice ‘Use a soft toothbrush’?

      Sam smile d

      Advert
      #26535
      Sam Stones
      Participant
        @samstones42903
        #403832
        JasonB
        Moderator
          @jasonb

          Possibly so that you don't lap away your even softer gums.

          #403865
          Ian S C
          Participant
            @iansc

            A hard brush will cause gum damage.

            Ian S C

            #403867
            Hopper
            Participant
              @hopper

              I use hard cast iron for laps so the softer job is lapped to conform with the shape of the lap.

              Soft tooth brush bristles bend to conform to the uneven shapes and crevices of hard teeth. Stiff bristles would skate right over top of gaps between teeth.

              Who sits around thinks about this stuff anyway?

              #403870
              Former Member
              Participant
                @formermember19781

                [This posting has been removed]

                #403875
                John MC
                Participant
                  @johnmc39344

                  My dentist tells me that a good electric toothbrush will not damage the gum, it actually does them some good, toughens them up and makes them lees liable to infection apparently.

                  #403933
                  Sam Stones
                  Participant
                    @samstones42903

                    Hopper said "Who sits around thinks about this stuff anyway?"

                    An old fuddy duddies like me who makes swarf no more, wondering how can he stir these clever blokes with stuff of little consequence.

                    It's not working crying

                    I had hoped for the last lap!

                    Sam smile d

                    #403941
                    Boiler Bri
                    Participant
                      @boilerbri

                      I use a hard one 😬 Soft one does not do it for me. My gums are so far receded which is just how it is. My teeth do not rattle 😂

                      Bri

                      #404005
                      Howard Lewis
                      Participant
                        @howardlewis46836

                        Sop far no one has been given the brush off!

                        Old toothbrushes are handy for cleaning taps after use, or threads in screw on chucks (Like Heinecken, they can reach the parts that paint brushes cannot! )

                        For our some of far flung overseas readers, Heinecken is a lager sold in UK.

                        I'll leave now!

                        Howard

                        #404007
                        AdrianR
                        Participant
                          @adrianr18614

                          Or for browny points with the misses, they are great for getting the crud off the back of diamonds in rings. Just dont let her catch you using hers to do it.

                          #404027
                          Nigel Graham 2
                          Participant
                            @nigelgraham2

                            Well, she could hardly expect you to clean her jewellery with a brush that's been inside a 4-jaw chuck full of swarf and cutting-fluid!

                            #404042
                            Neil Wyatt
                            Moderator
                              @neilwyatt
                              Posted by Sam Stones on 06/04/2019 02:29:32:

                              The stiffness of a toothbrush bristle is proportional to …

                              1. The cube of its length,

                              Pedant alert.

                              Isn't it inversely proportional to the cube of its length?

                              Neil

                              #404080
                              Sam Stones
                              Participant
                                @samstones42903

                                Absolutely Neil,

                                I stand corrected …

                                The softness of a toothbrush bristle is proportional to …

                                1. The modulus of the material,
                                2. The cube of its length,
                                3. The 4th power of its diameter.

                                Sam smile d … a not so alert pedant.

                                #404095
                                Cornish Jack
                                Participant
                                  @cornishjack

                                  Sort of on topic and the extraordinary knowledge base on this forum will, I'm sure, solve a mystery for me!

                                  I have two Oral B rechargeable toothbrushes – one for the downstairs and one for the upstairs bathroom. I use one in the morning after my shower and one upstairs at night before bed. Useage is essentially similar, similar toothpaste, similar cleaning time, both carefully dried after use and replaced in charger. After a couple of days use, the upstairs on its base starts to collect a hardening blob of toofh paste between the brush handle and the base, the downstairs one remains consistently clean. I have just cleaned the upstairs unit for the third time in a year and it's driving me crackers!! Why the difference and, given that both are cleaned and dried after use, where is the toothpaste residue coming from????? Other than overtime by the workshop gremlin, I have no idea!!

                                  rgds

                                  Bill

                                  #404114
                                  Sam Stones
                                  Participant
                                    @samstones42903

                                    An upstairs gremlin perhaps, Bill?devil

                                    Sam smile d

                                    Any chance of a photograph?

                                    #404120
                                    Sam Stones
                                    Participant
                                      @samstones42903

                                      Bill,

                                      Sight unseen, I suspect there's a sealing problem, and that a toothpaste slurry is working its way down the inside of the unit. Can you dismantle it without difficulty?

                                      Sam smile d

                                      #404124
                                      Cabinet Enforcer
                                      Participant
                                        @cabinetenforcer

                                        Bill, assuming this is consistent between brush head changes, then it will be temperature and humidity difference. On one brush the residual paste is drying out on the head and shank, to be washed off at next use, on the other it is running all the way down and collecting in the gap before it dries out.

                                        The unpleasant smell bothers me, and I have clearly spent too much time thinking about it 😁

                                        #404135
                                        Hopper
                                        Participant
                                          @hopper

                                          Posted by Cornish Jack on 07/04/2019 21:34:34:…

                                          …- one for the downstairs and one for the upstairs bathroom.

                                          Altitude.

                                          #404159
                                          Cornish Jack
                                          Participant
                                            @cornishjack

                                            Thank you all. Sam, quite right, of course …" better than a thousand words", so –

                                            Downstairs

                                            img_0023a.jpg

                                            andimg_0025a.jpg

                                            whereas, Upstairs –

                                            img_0026a.jpg

                                            and

                                            img_0028a.jpg

                                            … toothpaste, by the way, similar for both. Just doesn't make sense to me!

                                            rgds

                                            Bill

                                            #404160
                                            Hopper
                                            Participant
                                              @hopper

                                              Swap the two entire units between upstairs and dowstairs and see if prolem moves to. That way you know if problem is the unit or the environs or the toothpaste.

                                              Could be temp or humidity.

                                              Edited By Hopper on 08/04/2019 12:37:30

                                              #404162
                                              Ian S C
                                              Participant
                                                @iansc

                                                It's probably because of altitude differenceteeth.

                                                Ian S C

                                                #404222
                                                Neil Wyatt
                                                Moderator
                                                  @neilwyatt
                                                  Posted by Sam Stones on 07/04/2019 19:40:57:

                                                  Absolutely Neil,

                                                  I stand corrected …

                                                  The softness of a toothbrush bristle is proportional to …

                                                  1. The modulus of the material,
                                                  2. The cube of its length,
                                                  3. The 4th power of its diameter.

                                                  Sam smile d … a not so alert pedant.

                                                  Noooo!

                                                  It's proportional to 1 and 3 but inversely proportional to 2….

                                                  Neil

                                                  #404226
                                                  Neil Wyatt
                                                  Moderator
                                                    @neilwyatt

                                                    Assuming different users, one probably rinses the toothbrush more thoroughly.

                                                    #404255
                                                    mark costello 1
                                                    Participant
                                                      @markcostello1

                                                      Someone scrubbing something else with it while You are not there. winkMade anybody mad lately?

                                                    Viewing 25 posts - 1 through 25 (of 37 total)
                                                    • Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

                                                    Advert

                                                    Latest Replies

                                                    Home Forums General Questions Topics

                                                    Viewing 25 topics - 1 through 25 (of 25 total)
                                                    Viewing 25 topics - 1 through 25 (of 25 total)

                                                    View full reply list.

                                                    Advert

                                                    Newsletter Sign-up