CA1332154C

CA1332154C - Tooth-paste with brushing time indicator

Info

Publication number: CA1332154C
Application number: CA000611852A
Authority: CA
Inventors: Roch Romeo
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-07-06
Filing date: 1989-09-19
Publication date: 1994-09-27
Anticipated expiration: 2011-09-27
Also published as: FR2617709B1; EP0298839A1; FR2617709A1; ATE72969T1; DE3868729D1; ES2029337T3; EP0298839B1; GR3003979T3; US4876082A

Abstract

ABSTRACT OF THE DISCLOSURE

A tooth-paste comprising an addition of a coloring agent and of areducing agent for decoloring said tooth-paste under the effect of the brushing, wherein said tooth-paste is made of a fluorine-based tooth-paste, and includes methylene blue in a proportion of about 500 µl to 1 ml, in a 1 mg/ml solution, for 5 g of tooth-paste, that is a proportion of the order of 0.125 to 0.250 µM per gram of tooth-paste, and a reducing agent constituted by sodium ascorbate in powder form which is added at the moment of use.

Description

13~21~4 :~

--~ A TOOTH-PASTE WITH BRUSHING TIME INDICATOR
. ~, i ~ = ements to ~-oth-p-~ e-. It s ~el1 thatJ~in~:t:ental~hygiene, the ~brushing time of the~ teeth: is a o:rtant factor. This~brushinE~time is genera11y~diff1cu:lt and,~until no~,;no e$ficien~t~ and practical solutlon has for solving this~prob1em.~Actua1ly, effors have:~been made . ~ ~ t~s~vol;.~ 82 N0~8;,~Apri1~21, 1975,~page 349, Summary NO
1 ~ 32~ tQ~solve~this::~ oblem:~by~incorporating into the tooth-paste a natural~i ~ènt absorbed by~absorbants~such as cellulose,j~so as to~obtain an in~idation :rellat:ive~:to~ the efficient clèaning of the teeth~via a ;~of~;color.~ The ~same~;~oon ~rn :is also ~kno n ~in "Chémlcal vol.~lQ4~ iO 4~ ~January~ 1986~ page~290, Su ary NO ~i4979z"
whioh-~di~cl`oses ~a~tooth-paste~:composi~:lon exhibiting a change of coIor durlng~.the~ application~ which~incIudes~`~a~coloring agent and a reducing a~e~t.~Experience~sbow-~ehat~noDe of the prior techniques~allows, on~the IS.~ ;one ~ d~ Qbtaining a~goot~initial coloration of the~tooth-paste, and, on the~other~hand,~a pure~decoloration of the tooth-paste after an efficient .'! , ~ ~: ` .'; `, .

13321~4 brushing time, generally evaluated to about 3 minutes. The present invention aims at providing a new tooth-paste composition allowing the user to know with sufficient precision the minimum brushing time necessary for an efficient brushing.
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Obiects and Summary of the Invention According to the present invention there is provided a tooth-paste comprising a coloring agent to produce a colored tooth-paste and a reducing agent for decoloring the tooth-paste under the effect of brushing, wherein the tooth-paste is fluorine-based and contains methylene blue in a proportion of 500 ~1 to 1 ml, in a 1 mg/ml solution, for 5 grams of tooth-paste and a reducing agent compris-ng sodium ascorbate in powder form for mixing with the coloring agent at the moment of use.
,, ' Preferably, the sodium ascorbate i8 added to the colored tooth-paste at the moment of use in a proportion of the order of 90 mg for 5 grams of tooth-paste.

~etailed de~cription of the Invention Hereaf er is given an example of a non limiting embodiment of an improved tooth-paste according to the invention.
Obviously, thiR is only an example and any other embodiment ~ and/or variant thereof could also be envisaged without `~ departing from the scope of this invention.

An aqueous solution of 1 mg/ml methylene blue was prepared.
To 5~g of fluorine-based tooth-paste, presiently available in the trade, weighed in a porcelain or pyrex cup, have been mixed 500 ~1 or 1 ml of the methylene blue solution, that is 0.125 or 0.250 ~M per gram of tooth-paste. The concentration is chosen so as to obtain a good initial coloration of the tooth-paste.

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The colored tooth-paste has been added, at the moment of use, a reducing ;~ ;~agent constituted by sodium ascorbate in powder form, according to a ;~
proportion of 90 mg of sodium ascorbate for 5 g of tooth-paste, A pure ;
decoloration of the tooth-paste has been observed after a brushing time of about 3 minutes.

In order to put in practical use the tooth-paste which is the object of the present invention, this tooth-paste is conditioned in a standard tube comprising one or several columns in which is placed the sodium`~
ascGrbate, the standard fluorine-based tooth-paste occupying the `~
cylindral volume available about the sodium ascorbate columns, the tooth-paste plus sodium ascorbate mixture being thus provided at the moment of use by pressing the tube in the usual manner.
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Of course, the present invention is not limited to the embodiment hereinabove described and it encompasses all the variants thereof. i-~

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Claims

1. A tooth-paste comprising a coloring agent to produce a colored tooth-paste and a reducing agent for decoloring said tooth-paste under the effect of brushing, wherein said tooth-paste is fluorine-based and contains methylene blue in a proportion of 500 µl to 1 ml, in a 1 mg/ml solution, for 5 grams of tooth-paste, and a reducing agent comprising sodium ascorbate in powder form for mixing with the coloring agent at the moment of use.

2. A tooth-paste according to claim 1, wherein said sodium ascorbate is added to the colored tooth-paste at the moment of use in a proportion of the order of 90 mg for 5 grams of tooth-paste.

3. A tooth-paste according to claim 1, wherein said tooth-paste is dispersed within a tube comprising at least one column which contains said sodium ascorbate, the remaining portion of the tube containing tooth-paste, colored with methylene blue, whereby the colored tooth-paste plus reducing agent mixture is provided at the moment of use by pressing the tube.