Agent for protection of tooth surfaces, in conjunction with conventional bleaching methods, by biomimetic deposition of fluorapatite

1. A method for protecting a tooth surface, after tooth bleaching methods, by biomimetic deposition of apatite or fluorapatite on the tooth surface, comprising the following steps:

(a) providing at least one gel film A and at least one gel film B;

(b) applying said at least one gel film A to the tooth surface; and subsequently

(c) covering the at least one gel film A with the at least one gel film B; and

(d) repeating steps (a)-(c) as necessary for a period of time sufficient to achieve biomimetric deposition of apatite or fluorapatite on the tooth surface;

wherein:

said at least one gel film A is 50-1000 μm thick and comprises:

A1 at least one gel former,

A2 water or a mixture of water and an organic solvent,

A3 phosphate or hydrogen phosphate ions,

A4 optionally fluoride,

A5 optionally at least one amino acid, and

A6 optionally one carboxylic acid or a buffer system for a pH value from 4 to 7; and

said at least one gel film B is 50 μm to 5 mm thick and comprises:

B1 at least one gel former,

B2 water, and

B3 calcium ions Ca 2+ .

2. Method according to claim 1 , in which the at least one gel film A comprises:

A3 0.01-2 mol per liter of gel of a phosphate or hydrogen phosphate.

3. Method according to claim 1 , in which the at least one gel film B comprises:

B3 0.05 to 3 mol per liter of gel calcium ions Ca 2+ .

4. Method according to claim 1 , in which the gel former is gelatin.

5. Method according to claim 4 , in which the gelatin concentration in A and B is 1-15 wt. % each.

6. Method according to claim 5 , in which the gelatin concentration is 5-10 wt. %.

7. Method according to claim 1 , in which the phosphate or hydrogen phosphate is present as dissociated Na 2 HPO 4 , (NH 4 ) 2 HPO 4 or K 2 HPO 4 .

8. Method according to claim 1 , in which the calcium ions are present as dissociated CaCl 2 .